We explore a left-right symmetric model utilizing a double seesaw mechanism to generate Majorana masses for both light and heavy neutrinos, which facilitates significant lepton number violation, including contributions to neutrinoless double beta decay. The Higgs sector in this model includes two Higgs doublets, $H_L$, and $H_R$, while the fermion sector consists of the usual quarks and...
In this study, we analyse the mass spectra of all heavy pentaquarks using the Hyper-central Constituent Quark Model (hCQM) within a non-relativistic framework. Our focus is on computing the ground-state masses of pentaquarks that contain charm and beauty quarks, examining various spin-parity configurations J^P. This analysis employs two different confining potentials, complemented by an...
Motivated by the discovery of the $\Xi_{cc}^{+}$ doubly charmed baryon and the $T_{cc}^{+}$ tetraquark states, we have conducted a comprehensive exploration of doubly charmed pentaquarks, encompassing all possible configurations. This investigation was carried out using effective quark mass and shielded charge schemes. The classification of doubly charmed pentaquarks was achieved using the...
High-multiplicity proton–proton and proton–lead collisions at LHC energies exhibit similar signatures to those observed in Pb--Pb collisions (i.e. strangeness enhancement, collective expansion effects etc.), that are traditionally attributed to the formation of the quark–gluon plasma. In this contirbution the measurements of $\pi^{\pm}$, $K^{\pm}$, and p($\bar{p}$) transverse momentum spectra...
The study of neutron stars (NSs) with dark matter (DM) admixture has gained interest due to its potential to reveal insights into exotic matter and fundamental interactions. Understanding how DM influences NS properties, particularly oscillatory behaviors like $f$-mode oscillations, is crucial, as these modes could provide observational signatures of DM's presence in such extreme environments....
In the perturbative regime of quantum chromodynamics (QCD), exclusive diffractive processes, like exclusive vector meson production, are great ways to look into the structure of hadrons. The HERA accelerator facility explored the exclusive process involving light and heavy vector mesons, $e p \rightarrow e V(V=J/\Psi,\rho,\phi)$. This work focuses on the theoretical prediction of exclusive...
Two categories of four-fermion SMEFT operators are semileptonic (two quarks and two leptons) and hadronic (four quarks). At tree level, an operator of a given category contributes only to processes of the same category. However, when the SMEFT Hamiltonian is evolved down from the new-physics scale to low energies using the renormalization-group equations (RGEs), due to operator mixing this...
Since a long time ago, members of the High Energy Physics community have been using plastic scintillator paddles, coupled to a photomultiplier tube (PMT) as the detector for making a cosmic ray telescope to generate a cosmic ray muon trigger. One big drawback of such paddles has been the use of bulky photomultiplier tubes, which sometimes pose a great challenge in making a particular geometry....
The interaction of high-energy cosmic rays with Earth's atmosphere initiates a cascade of secondary particles known as an Extensive Air Shower (EAS). The Gamma Ray Astronomy at PeV EnergieS Phase-3 (GRAPES-3) experiment is a ground-based cosmic ray observatory, comprising approximately 400 plastic scintillators to detect the electromagnetic component and a large-area muon telescope to monitor...
One of the primary goals of ongoing and upcoming particle physics experiments is the study of QCD matter created under extreme condition of temperature and energy density called Quark Gluon Plasma (QGP). Earlier, it was believed that the QGP formation takes place only in heavy ion collision whereas the pp collision is being used as a baseline to study the QGP state is heavy ion collision....
In recent years, a lot of interest has been generated in the exploration of small collision system dynamics due to the observation of anisotropic flow coefficients ($v_{n}$) and enhanced production of (multi-) strange hadrons in high multiplicity p$-$p collisions at ALICE experiment. These observations imitate the characteristics of the deconfined quark-gluon plasma (QGP) matter formed in...
We know that the massive symmetric rank-two tensor is closely related to the linear theory of massive gravity, within the framework of open string theory. In the present work we develop a family of gauge fixing conditions to study the divergence problem of the Siegel-Zwiebach (SZ) propagator in the massless limit. The SZ Lagrangian describes a massive rank two tensor interacting with a vector...
Coronal Mass Ejections (CMEs) are massive eruptions of plasma along with strong magnetic fields that have the potential to significantly affect Earth's magnetosphere, producing geomagnetic storms (GMSs) when high-energy particles in the plasma interact. Thus, it is essential to investigate the basic dynamics of CME evolution, propagation, and interaction with the ambient solar wind, to...
The angular distribution of atmospheric cosmic-muons is studied using PYTHIA8 simulations and the simulation results were contrasted with the experimental data. In this work, the standalone PYTHIA8 code is augmented by adding oxygen molecules in a relative abundance of 78:22 (Nitrogen:Oxygen) to resemble a more realistic atmosphere [1]. The integrated vertical intensity $(I_{\mu}(\theta))$ of...
In this work, we extend the scope of the JETSCAPE framework to cover the jet radius parameter ($R$) dependence of the jet nuclear modification factor, ${R_{AA}}$, for broader area jet cones, going all the way up to $R$ = 1.0 . The primary focus of this work has been the in-depth analysis of the high-${p_{T}}$ inclusive jets up to 1 TeV (to probe the quark-gluon plasma medium at much shorter...
In this work, we have formulated a new class of traversable wormhole metrics. Initially, we have considered a wormhole metric in which the temporal component is an exponential function of $r$ but the spatial components of the metrics are fixed. Following that, we have again constructed a generalized wormhole metric in which the spatial component is an exponential function of $r$, but the...
We explore a new parametrization scheme, known as exponential parametrization, for the Majorana neutrino mass matrix. In this framework, the elements of the mass matrix are represented in terms of their absolute values and arguments. We propose a neutrino mass matrix texture that highlights four correlations among its elements under this parametrization scheme. For normal ordering, the mixing...
In the field of neutrino physics, the tribimaximal (TBM) mixing scheme and its associated $\mu-\tau$ symmetric texture have garnered a lot of attention due to their predictability of mixing angles and simple structures.Recent experiments, however, shown that the TBM scheme is only partially valid, particularly due to its prediction of a vanishing reactor mixing angle ($\theta_{13}=0$).This...
In this work, we introduce a novel technique for measuring the longitudinal and transverse polarization fractions of boosted hadronic $W$ boson decays. We propose a jet substructure observable, $p_{\theta}$, derived from subjet energies, serving as a proxy for the
$W$ boson's parton-level decay polar angle in its rest-frame. This observable is sensitive to $W$ boson polarization and offers...
One of the outstanding questions in studies of the QCD phase diagram
is to determine the order of the QCD phase transition and, in case it
turns out to be second order, determine the underlying universality class
that controls its universal critical behavior in the vicinity of chiral phase transition temperature $T_c$ . Previous works estimate this $T_c$
by extrapolating pseudo-critical...
Numerous neutrino experiments have confirmed the phenomenon of neutrino oscillation,providing direct evidence of the quantum mechanical nature of neutrinos. In this work, we investigate the entanglement properties of neutrino flavor states within the framework of three-flavor neutrino oscillation using two major entanglement measures: entanglement of formation (EOF) and concurrence, utilizing...
After the discovery of the 125 GeV Higgs boson (H) at CERN LHC, the next physics program is set on measuring its properties with precision as well as searching for new physics. In some of the Beyond Standard Models (BSM) such as next to minimal supersymmetric standard model (NMSSM), the Higgs sector is extended by adding an additional doublet, and also a singlet scalar. The extended Higgs...
In this study, we examine the chemical freeze-out curve in ultra-relativistic nucleus-nucleus collisions by extracting freeze-out parameters from particle ratios within the van der Waals hadron resonance gas (VDWHRG) framework. We analyze data from high-energy collision experiments, including the Super-Proton-Synchrotron (SPS), Relativistic Heavy Ion Collider (RHIC), and the Large Hadron...
In high-energy collisions of hadrons or heavy-ions , conservation laws play an important role in particle production, most relevant being the conservation of electric charge, strangeness, and baryon quantum numbers. The phenomenological modeling of particle production has two primary approaches; statistical hadronization model (SHM) and string fragmentation. These models handle conservation...
We present a unified non-relativistic framework to study the charmonium and bottomonium systems. We utilize the Cornell potential, along with spin-dependent interactions, and optimize the parameters to simultaneously describe the spectra of both systems. We analyze the impact of these “uniform fit” parameters and individual interactions on the mass spectra, including the non-linearity in...
The manifestly covariant, dual symmetric and gauge invariant two potential theory of generalized electromagnetic fields of gravito-dyons has been developed consistently from U(1)×U(1) gauge symmetry. Corresponding field equations and equation of motion are derived from Lagrangian formulation adopted for U(1)×U(1) gauge symmetry for the justification of two four potentials of gravito-dyons.
The gain of gaseous detectors like GEM detectors depends upon the concentration of gas mixtures, temperature, and pressure inside the gas volume. For this reason, it is important to know that the gas leakage from the detector can cause fluctuation in the pressure and temperature, and it can affect the gain of the detector. In this talk, we present the development of the high-sensitivity gas...
Quantum Chromodynamics (QCD) is the fundamental theory that describes strong interactions, which is an interesting problem in the non-perturbative regime due to the quark confinement and strong coupling of interactions. In Light-front holography (LFH), a favorable approach is studied to acknowledge these intricacies by mapping QCD onto a higher-dimensional anti-de Sitter (AdS) space, allowing...
Future collider experiments require tracking detectors with better time and spatial resolution than current technologies. Low Gain Avalanche Diodes (LGADs) offer a viable solution, providing time resolution $<$ 20 ps and spatial resolution $\sim$ 50 $\mu$m using pixel segmentation. At HL-LHC, with an average of 1.6 collisions/mm, LGADs significantly improve fake jet rejection and jet-tagging...
The Large Hadron Collider (LHC) at CERN operates at a center-of-mass energy of 13.6 TeV, well above the electroweak scale. This energy enables the production of particles such as W and Z bosons, the Higgs boson, top quarks, and any new particles with masses near the electroweak scale. The high energy results in large boosts, causing their hadronic decays to become collimated and allowing them...
We investigate a well-motivated Trilinear Lepton Number Violating Supersymmetric model with both LLE and LQD couplings to account for neutrino oscillation data. Our analysis includes neutrino mass splittings, mixing angles from oscillation data, and additional experimental constraints such as the Higgs mass, coupling modifiers, and low-energy flavor-violating observables. To achieve a good...
Calorimetry at the High Luminosity LHC (HL-LHC) faces two enormous challenges, particularly in the forward direction: radiation tolerance and unprecedented in-time event pileup. To meet these challenges, the CMS Collaboration is preparing to replace its current endcap calorimeters for the HL-LHC era with a high-granularity calorimeter (HGCAL), featuring a previously unrealized transverse and...
Within the framework of relativistic independent quark (RIQ) model based on a flavor-independent interaction potential in scalar-vector harmonic form, we analyze the exclusive two-body nonleptonic decays of $B_{d(s)}$ meson to ground as well as radially excited $2S$ charmonium state with a light meson $K_s$, induced by the $b\to c\bar{c}s(d)$ transition. We calculate the weak form factors...
In the High Luminosity phase of the LHC, the High Granularity Calorimeter (HGCAL) are the planned replacement end-cap calorimeters to handle the increased radiation levels. HGCAL is a sampling calorimeter that uses silicon and plastic scintillators as active material. The talk goes over the intricacies of HGCAL geometry and their implementations in CMS Software Framework. The shape and...
This study focuses on a combined analysis of various available inputs to constrain the parameter spaces of a simplified dark matter (SDM) model featuring a spin-0 mediator and fermionic dark matter (DM). The spin-0 mediator interacts with standard model (SM) fermions, SM gauge bosons, and DM. We constrain the parameter spaces of different relevant couplings, DM mass, and the mediator mass,...
We explore the 21-cm signal in our Universe containing inhomogeneous matter distribution at considerably large scales. Employing Buchert's averaging procedure in the context of a model of spacetime with multiple inhomogeneous domains, we evaluate the effect of our model parameters on the observable 21-cm signal brightness temperature. Our model parameters are constrained through the Markov...
This analysis investigates forward-backward (FB) multiplicity correlations in proton-proton (pp) collisions at $\sqrt{s} = 13$ TeV, using two prominent event generators: PYTHIA8, based on the Lund String model, and HERWIG7, which utilizes the Cluster Hadronization model. Simulated events were analyzed within varying pseudorapidity ($\eta$) windows, applying a transverse momentum ($p_{\rm{T}}$)...
We examine the $Y=0$ real Higgs triplet model. In addition to the SM Higgs, it contains a $CP$-even neutral Higgs ($\Delta^0$) and two charged Higgs bosons ($\Delta^\pm$), which are quasi-degenerate in mass. We first study the theoretical constraints from vacuum stability and perturbative unitarity and then calculate the decay widths of $\Delta^0$ and $\Delta^\pm$, including the loop-induced...
Angular distributions of heavy hadronic decays can serve as valuable observables for testing the Standard Model and identifying potential signals of new physics. In cases where new physics (NP) effects are not apparent in branching ratios or are obscured by hadronic uncertainties, these effects may still be detectable in the angular distributions.
In our study, we focus on the $b \to c$ and...
Azimuthal anisotropy quantified as anisotropic flow coefficients are important observables that can provide key information about the collectivity of the system formed during heavy-ion collisions. The anisotropic flow coefficients are sensitive to both the geometrical configuration of the collision overlap region and the transport properties of the medium. Recently, hints of collectivity in...
The upcoming $O+O$ collision run at the Large Hadron Collider (LHC) at $\sqrt{s_{\mathrm{NN}}}$ = 7 TeV offers a unique opportunity to explore the behavior of matter under extreme conditions, bridging the gap between small and large collision systems. In this study, we provide predictions for the transverse momentum ($p_T$) spectra and flow observables for different centrality classes in $O+O$...
We employ Maximum Likelihood Estimators to examine the Pantheon+ cata-
logue of Type Ia supernovae for large scale anisotropies in the expansion rate of
the Universe. The analyses are carried out in the heliocentric frame, the CMB
frame, as well as the Local Group frame. In all frames, the Hubble expansion rate
in the redshift range 0.023 < z < 0.15 is found to have a statistically...
With its profound ability to detect particles efficiently and provide excellent timing and spatial resolutions, the Gas Electron Multiplier (GEM) detector has become a highly useful technology in the radiation imaging technique. The large-size imaging detectors can be easily fabricated with GEM detectors due to its low cost. These imaging detectors can be utilized for cargo imaging, soil and...
In quantum theory, the solutions of most of the solvable systems are related to the well-known classical orthogonal polynomials namely the Hermite orthogonal polynomials, Laguerre orthogonal polynomials or the Jacobi orthogonal polynomials etc. In this work, listed all the newly discovered orthogonal polynomials (also known as exceptional orthogonal polynomials) with their important properties...
Gaseous ionization detectors are essential instruments in particle physics for detecting ionizing particles and measuring radiation in protection applications. One notable type is the straw tube, which consists of gas-filled cylindrical tubes with a conductive inner layer serving as a cathode and an anode wire along the cylinder's axis. These detectors facilitate the reconstruction of neutrino...
Resistive Plate Chambers (RPCs) are widely used in high-energy physics experiments to detect charged particles. However, their performance can degrade over time due to outgassing and ageing effects, impacting long-term detector reliability. This study aims to investigate these potential outgassing and ageing effects in RPCs, which can compromise sustained high-performance operation.
Data...
We examine the $K \Lambda$ production induced by real/virtual photons on the nucleon target, covering an energy range from threshold to photon energies of 3 GeV. This process provides vital insights into nucleon resonances, particularly those in higher resonance regions. Key objectives in studying kaon photo- and electroproduction on nucleons include investigating the baryon resonance spectrum...
This project aims to automate the comparison of GEM efficiency plots, replacing the current manual inspection process. Each run generates efficiency plots that must be assessed for efficiency. Our proposed solution involves developing a Python script that utilizes OpenCV for automated image comparison based on defined metrics.The system evaluates the comparison against predefined criteria to...
We investigate the effects of including strong charge parity violating effects through axion field on the structure and the oscillation modes of the neutron stars with the possibility of a quark matter core. The effects of axions in quark matter is described through a t Hooft determinant interaction in the flavor space within the ambit of a three flavor Nambu--Jona-Lasinio model. The presence...
Motivated by the great interest in holographic dark energy models, this study reconstructs Barrow Holographic Dark Energy (BHDE) within the Saez Ballester framework in a homogeneous and anisotropic Kantowski Sachs universe. Interacting and non-interacting scenarios are considered, with the future event horizon serving as the infrared cut-off. Our analysis examines the evolution of the Equation...
We investigate a minimal extension of the Standard Model that includes an additional baryophilic Abelian gauge symmetry. In these classically conformal models, the thermal phase transition, driven by the Coleman-Weinberg mechanism, is strongly first-order with significant supercooling, producing observable stochastic gravitational wave signals. Our analysis reveals a substantial parameter...
We study the semileptonic weak decays of the Bc meson decaying to axial-vector (A) mesons in the final state for bottom-conserving decay modes. We use the self-consistent covariant light-front quark model (CLF QM) to eliminate the inconsistencies in the traditional type-I CLF QM. We establish the self-consistency for Bc → A meson transition form factors and ensure that these form factors are...
The study of hadron production containing charm or beauty quarks in proton-proton (pp) collisions provides essential insights into the predictions of perturbative quantum chromodynamics (pQCD). The ALICE detector allows for precise measurements of non-prompt D-meson production, which serves as an effective tool to explore the production of beauty quarks in pp collisions.
This analysis...
Exploring parameter spaces in Beyond Standard Model (BSM) scenarios, especially in high-dimensional cases, is computationally prohibitive and inefficient with conventional sampling due to the curse of dimensionality. In this study, we implement a Machine Learning (ML)-assisted Nested Sampling (NS) approach to estimate the posterior distribution of the Type-II Seesaw Model. We use a generative...
Data from LHC Run-I and Run-II have placed strong constraints on the electroweakino masses in R-parity conserved supersymmetric scenarios. However, in R-parity violating (RPV) scenarios, these constraints can vary depending on the specific RPV decay modes of the lightest supersymmetric particles (LSP). In this work, we explore the potential implications of the baryon-number-violating...
Diffuse neutrinos from past supernovae in the Universe present us with a unique opportunity to test dark matter (DM) interactions. These neutrinos can scatter and boost the DM particles in the Milky Way halo to relativistic energies allowing us to detect them in terrestrial laboratories. In this talk, I will discuss how the consideration of energy-dependent cross-sections for DM interactions...
Higgs Boson is characterized by J$^\pi$ = 0$^+$ and fundamentally forms the cosmos by interacting with other particles to impart mass in standard model. This study is focused on Z$\gamma$ channel of Higgs with branching ratio of $\beta(H \rightarrow Z\gamma) = (1.57 \pm 0.09) \times 10^{-3}$. Feynman diagram for Z$\gamma$ channel is similar to $\gamma$$\gamma$ channel, and loop diagrams in...
Charge asymmetry is examined by comparing the electron/muon---proton scattering with positron/anti-muon---proton scattering. This method is a sophisticated tool for investigating the two-photon exchange phenomenon, which significantly contributes to the radiative corrections to the lepton---proton scattering. The emission of real photons (Bremsstrahlung process) also contributes to the...
We consider a strongly interacting fermionic matter that is in direct interaction with the fermionic dark matter via the exchange of Standard Model Higgs boson. Invoking quasi-particle description for strongly interacting fermions with dynamic quasi-particle excitations we evaluate the thermodynamic properties of this matter in relativistic mean-field approximation. Taking into consideration...
We address the issue of cancellation of infrared (IR) divergences at the amplitude level in Light Front Quantum Chromodynamics (LFQCD) using the coherent state formalism. We consider the process $e^{+}e^{-}\rightarrow q\bar{q}g$ upto $\mathcal{O}(g^3)$ in light-cone-time-ordered Hamiltonian perturbation theory and show that IR divergences in S-matrix elements appear due to vanishing energy...
Future long-baseline experiments will play an important role in exploring physics beyond the standard model. One such new physics concept is the large extra dimension (LED), which provides an elegant solution to the hierarchy problem. This model also explains the small neutrino mass in a natural way. The presence of LED modifies the standard neutrino oscillation probabilities. Hence, the...
Centrality dependence of forward-backward ({\footnotesize FB}) multiplicity correlations in Pb-Pb collisions at LHC energies, $ \sqrt s_{NN} = 2.76 $ and $5.02$ TeV are studied with the HYDJET++ Model and the finding are compared with the those reported for the ALICE data. Sensitivity of correlation strength on the centrality bin width and method of centrality selection are also looked into....
The high-luminosity era of the LHC will pose unprecedented challenges to the detectors. To meet these challenges, the CMS detector will undergo several upgrades, including the replacement of the current endcap calorimeters with a novel High-Granularity Calorimeter (HGCAL). Developing a reconstruction sequence that fully exploits the granularity to achieve optimal electromagnetic and hadron...
The behavior of a chaotic system and its effect on existing quantum correlation has been holographically studied in the presence of nonconformality. Keeping in mind the gauge/gravity duality framework, the nonconformality in the dual field theory has been introduced by considering a Liouville type dilaton potential for the gravitational theory. The resulting black brane solution is associated...
We study the flavor dependance of the Chiral Magnetic Effect (CME) using two of the primary correlators used to characterize the charge separation effect. These are the correlator $\Delta\gamma $ and the correlator $R_{{\psi}_2}$. We use the AMPT (A Multiphase Transport Model) model to study the sensitivity of these correlators to two and three flavors of quarks. The AMPT model used has a...
Future collider experiments demand pixel detectors capable of withstanding higher energy and luminosity. In response, MALTA, a novel monolithic active pixel detector, has been developed with a cutting-edge readout architecture, offering exceptional radiation tolerance, high hit rates, superior spatial resolution, and precise timing. Developed with 180nm CMOS imaging technology. MALTA...
The MALTA monolithic active pixel detector has been developed to address the challenges anticipated in future high-energy physics detectors. As part of its characterization, we conducted fast-timing studies necessary to provide a figure of merit for this family of monolithic pixel detectors. However, conventional Laser techniques are limited due to reflection on the metal layers of the sensor...
Thallium-doped CsI scintillators are well-regarded for their high light output (~64,000 photons/MeV), relatively fast decay time, and responsiveness to various types of radiation, making them strong candidates for applications in medical imaging, security scanning, high-energy physics, and other radiation detection fields. However, a limitation of CsI(Tl) is its long afterglow, which reduces...
The neutral pion production significantly contributes to the hadronic final state in neutrino interactions. Robust oscillation analyses increasingly depend on Monte Carlo event generators to accurately model these interactions on nuclear targets. With systematic uncertainties expected to play a prominent role in future oscillation measurements, integrating pion production models into these...
We have calculated the charge and heat transport coefficients of a hot QCD medium by solving the relativistic Boltzmann transport equation in the Bhatnagar-Gross-Krook (BGK) model with a modified collision integral
in the weak magnetic field regime. The modified collision integral with the instantaneous particle number conservation enhances charge and heat transport phenomena, as evidenced...
The INO-ICAL collaboration has developed a prototype detector called mini-ICAL at IICHEP, Madurai, India ($9^\circ \, 56' \, \text{N}, 78^\circ \, 00' \, \text{E}$) to evaluate detector performance and address the engineering challenges associated with constructing a large-scale INO-ICAL detector. The mini-ICAL consists of 11 layers of iron plates, each measuring $4 \, \text{m} \times 4 \,...
We propose a novel particle physics framework that addresses multiple cosmological tensions and anomalies by incorporating self-interacting dark matter (SIDM) and dark radiation (DR) within an abelian gauge extension of the Standard Model. Our model features a $U(1)_D$ gauge symmetry that accommodates SIDM candidates which interact through the exchange of the $U(1)_D$ gauge boson. The...
The CMS experiment at CERN operates a two-stage trigger system to efficiently filter and record events of potential physics interest. The system consists of a hardware-based Level 1 (L1) trigger, which processes detector data at 40 MHz using fast electronics such as FPGAs and ASICs, reducing the data rate to around 110 kHz. This is followed by a software-based High-Level Trigger (HLT), which...
The High-Luminosity Large Hadron Collider (HL-LHC) upgrade will substantially increase the instantaneous luminosity, achieving values between 5 × 10^34 cm⁻² s⁻¹ and 7 × 10^34 cm⁻² s⁻¹, approximately seven times the nominal level. This upgrade intensifies the particle flux, creating significant challenges for the forward sections of the Compact Muon Solenoid (CMS) detector. In response, new Gas...
In the coming year, the LHC will upgrade to the High-Luminosity LHC (HL-LHC), with operations projected to commence in 2029. This ambitious upgrade introduces significant challenges, most notably increased interaction rate. The CMS collaboration plans to enhance its tracking system by 2026 to address the high radiation environment. The upgraded CMS outer tracker (OT) will feature advanced,...
The conventional semi-classical study of quantum evaporation of a black hole assumes the self-similarity of the black hole throughout its entire lifetime. However, this assumptions ignores the effect of back-reaction of the emission on the black hole itself. Recent studies have suggested that the back-reaction may lead to a new effect called ``memory burden" that slows down the evaporation...
Neutrino nucleus elastic scattering (νAel) is a direct test of electroweak theory in the Standard Model of particle physics [1]. The νAel cross-section has been measured with the stopped pions neutrinos, whereas the cross-section measurement for low-energy solar and reactor neutrinos has not yet been accomplished [2]. Using state-of-the-art point contact Germanium detector technology, the...
Predicted soon after the discovery of the $Z$ boson, coherent neutrino-nucleus elastic scattering (C$\nu A_{el}$) is a Standard Model (SM) process in elementary particle physics. The observation of C$\nu A_{el}$ is pivotal in advacing our understanding of the SM and exploring potential physics beyond it [1, 2]. The goal of the TEXONO experiment is to observe C$\nu A_{el}$ of reactor electron...
In this talk, I will present our development of a new framework for relativistic perfect-fluid hydrodynamics that includes spin degrees of freedom, building on recent theoretical advancements aimed at explaining spin polarization in heavy-ion collisions. While standard relativistic hydrodynamics has successfully described the properties of the strongly-interacting matter produced in these...
On Earth, the flux of cosmic rays measured at ground level fluctuates, primarily influenced by two main factors: solar activity in space and atmospheric effects which influence the daily variations of the count rate of particle detectors. However, the effects of temperature, humidity, electric field, and gravity are negligible in comparison to the effect of pressure; and the correction for the...
The Dirac Scotogenic model provides an elegant mechanism for generating small Dirac neutrino masses at the one-loop level. A single abelian discrete $\mathcal{Z}_6$ symmetry simultaneously protects the ``Diracness'' of the neutrinos and the stability of the dark matter candidate. This symmetry originates as an unbroken subgroup of the so-called 445 $U(1)_{B-L}$ symmetry. Here we thoroughly...
The recent 12 GeV energy upgrade at the Thomas Jefferson National Accelerator Facility in Virginia has opened many new experimental possibilities including need for advancements in beam polarization measurement techniques. We will present some results from the preliminary analysis framework developed using GEANT4 for the Compton data analysis along with other novel ideas being attempted. We...
In this paper, we make an attempt to estimate the famous Avogadro number with programming logics written in Python associated with advanced nuclear binding energy formulae and our proposed strong and electroweak mass formula pertaining to 4G model of final unification. Average rest mass of nucleon, nuclear binding energy per nucleon and electron rest mass seem to play a vital role in...
Dark matter (DM) genesis via Ultraviolet (UV) freeze-in embeds the seed of reheating temperature and dynamics in its relic density. This talk presents a novel framework for deducing the Universe's reheat temperature from collider signals associated with DM production. Lepton colliders excel in DM searches due to their well-defined center-of-mass energy and low hadronic contamination,...
We investigate a model connecting the neutrino sector and the dark sector of the universe through a mediator $\phi$. This mediator is stabilized by a discrete $\mathcal{Z}_4$ symmetry, which, upon $\phi$ developing a non-zero vacuum expectation value ($v_{\phi}$), reduces to a remnant $\mathcal{Z}_2$ symmetry. Within this framework, the observed baryon asymmetry of the universe is explained by...
ABSTRACT
$Λ$CDM models for dark energy are proposed using various functional forms to represent different cosmological models and solve the mysteries of the universe. In the present article keeping the concept of varying fine structure constant, two such basic models with function of scale factor are correlated to produce a common condition for the $Ω_Λ,Ω_m,Ω_mo$. The novelty of this...
We constrain the nuclear matter equation of state by including the isoscalar-vector and isovector-vector coupling using the Bayesian approach. We use the recent observation GW190814 (R. Abbott et al 2020 ApJL 896 L44) for the compact star of mass 2.6 M$_{\odot}$ along with the nuclear saturation properties for finite and infinite nuclear matter at saturation properties at saturation and...
Regular phantom black holes (RPBHs) hold theoretical and observational significance due to their incorporation of the phantom scalar field, an alternative to the cosmological constant, and some of their thermodynamical properties have also been studied. Several RPBH properties, such as the horizon radius, entropy, etc., rely on the scale parameter 𝑏𝑏. Because of the distinct structure compared...
The compact astrophysical objects like rotating neutron star are considered to be the universal charge particle accelerators and the prominent source of high energy photons. Their axial rotation cause the co-rotation of their magnetosphere. As a result the dipole magnetic field $B$ of the compact star induces the strong electric field $E_{\parallel}$ parallel to $B$. Such strong...
Accurate determination of the nuclear composition and energy spectrum of primary cosmic rays, particularly in the region around the knee ($\sim3$ PeV), is crucial for understanding their origin, acceleration mechanisms, and interactions with the interstellar medium. The GRAPES-3 experiment, located in Ooty, India, utilizes a dense array of plastic scintillator detectors, along with a...
As the universe is dynamic, the best way to treat with the cosmological models are of course with dynamical systems. This work studies cosmological scaling solutions and their stability in models involving a scalar field with constant coupling interaction. We consider logarithmic potential for the scalar field and analyse its impact on the dynamics of the universe. We find scaling solutions...
Equation of State of the coupled dark energy can be expressed in terms of the ration of total pressure to the vacuum energy density. Here in this article the stability of the saddle points are produced for different types of functions which can be considered to produce the quintessence models. Chosen functions are further tested with CPL parameterization to fit them for dark energy models.
Although the recent measurements of ( R_{K^{(*)}} ) in ( b \rightarrow s\ell\ell ) transitions are consistent with standard model predictions, there exist several other observables such as ( P'_5 ), ( \mathcal{B}(B_s \rightarrow \phi \mu^+ \mu^-) ), and ( \mathcal{B}(B_s \rightarrow \mu^+ \mu^-) ) that show deviations from the SM predictions. In this context, we employ an effective...
ABSTRACT
Generally the cosmological $ꓥ$CDM models are constructed with $𝑓(𝑎)∝a^3$. Considering a cubic function $𝑓(𝑎)$, the vacuum energy density is calculated and corresponding constraints are tuned with Chevallier-Polarski-Linder (CPL) equation of state parameterization. During the construction of the Problem the function $𝑓(𝑎)$ is assumed to be carrying cubic, quadratic and liner...
We explore the role of dark matter in connection with flavor physics by using the dark force carriers, dark $Z$ and dark photon. We perform a global fit to the new parameters using existing data on $b \to s \mu^+ \mu^-$ transitions. With these constrained parameters, we examine the improvements in the branching ratios and angular observables of the semileptonic $B_c \to D_{s}^{(*)} \mu^+...
We investigate the fundamental oscillation modes of anisotropic dark energy stars using the Chaplygin prescription, incorporating anisotropic effects via the Bowers-Liang model. We study the global properties of anisotropic dark energy stars by solving stellar structure equations, and also compare the obtained mass-radius profiles with observational data from gravitational wave events and...
This study investigates the formulation of quarkyonic matter in neutron stars (NS), where both quarks and nucleons are treated as quasi-particles, facilitating a cross-over transition between these phases. Building on early quark matter (QM) theories, this approach aligns with observational constraints on NS properties, such as maximum mass and canonical radius. To enhance the model, we...
Numerous cosmological observations supporting the remarkable fact that baryonic matter which form stars, galaxies, and clusters consist only 15% of the total matter in the universe and ~ 85% amount to a non-radiating form of matter(known as dark matter(DM)) that cannot originate from any Standard Model (SM) particle, has made it one of the most interesting topic at the frontier of particle...
The coupling of neutrinos with complex scalar dark matter particles can have interesting phenomenological signatures in neutrino oscillation experiments. For time-averaged data, it appears as an energy-dependent correction to the mass-squared term in the neutrino Hamiltonian. We study the effect of neutrino scattering with scalar dark matter termed dark Non-Standard Interaction (dark NSI) in...
A cosmic muon veto detector is being built around the RPC detector which is operational at TIFR, Mumbai. It will study the feasibility of building a shallow depth neutrino detector. It’s being built using extruded plastic scintillator (EPS) strips. Muon interactions in the EPS are detected by SiPMs mounted at the end of 2 wavelength shifting fibres which are inserted in the EPS strips.
The...
The CMS Collaboration is preparing to replace its current endcap calorimeters for the HL-LHC era with a high-granularity calorimeter (HGCAL), featuring a previously unrealized transverse and longitudinal segmentation, for both the electromagnetic and hadronic compartments, with 5D information (space-time-energy) read out. The proposed design uses silicon sensors for the electromagnetic section...
To study the feasibility of a shallow-depth neutrino detector, a Cosmic Muon Veto Detector (CMVD) is being built around the RPC detector stack at TIFR, Mumbai. The CMVD will use extruded plastic scintillators for muon detection and wavelength-shifting fibers coupled with silicon photomultipliers (SiPMs) for signal readout. These SiPMs require a very accurate, precise, and stable power supply...
The precise measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle $\phi_{3}$ plays a crucial role in testing the consistency of the standard model (SM) description of $CP\!$ violation. The determination of $\phi_{3}$ with $B^-\to D^{(*)}K^-$ decays is theoretically robust, free from loop-level contributions, making it an ideal benchmark for comparison with...
High-energy cosmic muons, produced in the upper atmosphere through the decay of particles like pions and kaons, descend to the Earth’s surface. Leveraging the interaction of these high-energy muons with matter offers a powerful technique for non-invasive imaging, as they can penetrate dense materials. Depending upon the energy, muons either scatter or are absorbed when passing through objects....
This study presents the development of indigenous resistive paints for application in high-energy physics (HEP) experiments, particularly in resistive plate chambers (RPCs). The aim is to create an affordable and effective conductive coating to enhance the efficiency and positional resolution of RPC detectors. Observations indicate that the resistance of the paint fluctuates during drying,...
During the past quarter century, there have been many attempts to observe a possible inverted Gaussian-shaped decrease during total solar eclipses, coinciding lowest point with totality [1], but these attempts have ended with contradictory results. Here, we introduce an experimental setup optimized for cosmic γ-ray collection, minimizing terrestrial interference. Leveraging four large-volume...
The demand for portable neutron detectors is rapidly increasing in fields such as medical diagnostics, environmental monitoring and, and nuclear safety, where precise detection of neutron radiation is crucial in areas with potential radioactive exposure. This study presents the detection efficiency of neutrons using boron-loaded plastic scintillators, analyzed through Monte-Carlo simulations....
Our group at TIFR is participating in the development, fabrication, and assembly of backend carrier boards based on the AdvancedTCA form factor for trigger electronics of the CMS high-granularity calorimeter (HGCAL). Specifically, we are developing a general-purpose ‘Serenity’ board that will be compatible with most subdetectors, including HGCAL, for the Phase-2 Upgrade of the CMS experiment...
Gamma-ray bursts (GRBs) are cataclysmic astrophysical events, classified into long-duration (lasting ≥ 2 seconds) and short-duration bursts. We investigated two subcategories of GRBs: choked and low-luminosity (LL) GRBs, focusing on their potential to emit high-energy neutrinos. Our analytical approach incorporates pion and kaon decay mechanisms, taking into account cooling effects such as...
We estimate the diffusion coefficient matrix for baryon number, strangeness, electric charge, and charm quantum numbers in an interacting hadron gas. For the first time, this study provides insights into the charm current and estimates the diffusion matrix coefficient for charmed states, treating them as part of a quasi-thermalized medium. We analyze the diffusion matrix coefficient as a...
We propose a model based on $A_4$ modular symmetry in the Inverse seesaw framework to realise light Dirac neutrino mass. This requires extension of SM fermionic sector by three right-handed neutrinos $(ν_R)$, three heavy right-handed fermion field $(S_R)$ and three heavy left-handed fermion field $(S_L)$. The scalar sector of SM is also extended by $SU(2)_L$ singlet ψ. The application of...
The Standard Model (SM) of particle physics, while highly successful, leaves several key phenomena unexplained, motivating the search for physics beyond the SM (BSM). One promising extension is the Leptophobic U(1) model, which avoids collider search constraints and introduces right-handed neutrinos (RHNs). These RHNs can participate in neutrino mass generation via seesaw mechanisms, leading...
It is a common lore that in the thermal leptogenesis in the type-1 seesaw scenario with the conventional hierarchy of the heavy right-handed neutrinos (RHNs), that the CP violating, out of equilibrium decay of the lightest RHN ($N_1$) is the only relevant source of $B-L$ asymmetry. Any asymmetry produced by the heavier RHNs get washed out by the lepton number violating processes mediated by...
It is beyond any doubt that quantum chromodynamics (QCD) is the theory of strong interactions. While its perturbative aspects have been studied, its non-perturbative aspects are not so well explored. This non perturbative domain is called QCD vacuum and is studied by effective field models. One such model to study QCD Vacuum regime is NJL model. Using NJL model we will obtain QCD vacuum hadron...
Driven by the persistent anomalies observed in the $ b \to (u, c) \tau \bar{\nu}_\tau $ decays, we investigate these transitions within the framework of effective field theory, incorporating possible contributions from light right-handed neutrinos. By performing a global fit to the available experimental data, including measurements of $ R_{D^{(*)}} $, $R_{J/\psi} $, $ R_{\pi} $,...
Isospin-equilibrating weak processes, called “Urca” processes, are of fundamental importance in astrophysical environments like (proto-)neutron stars, neutron star mergers, and supernovae. In these environments, matter can reach high temperatures of tens of MeVs and be subject to large magnetic fields. We thus investigate Urca rates at different temperatures and field strengths by performing...
Scalar non-standard interaction (SNSI) is the interaction of neutrinos with standard model fermions mediated by a scalar particle. SNSI is an interesting beyond the Standard Model (BSM) scenario as it appears to be a density-dependent perturbation to neutrino mass, introducing absolute mass dependence to neutrino oscillations. In this work, we present compact analytic expressions for neutrino...
In relativistic nuclear collisions, spatial anisotropies characterized by initial eccentricity, triangularity, and higher-order eccentricities arise from the geometry of the collision and fluctuations in the initial energy density distribution. These spatial anisotropies subsequently manifest as momentum anisotropies in the final-state particles through the collective expansion of the hot and...
Inspired by the null detection of dark matter from direct search experiments, we propose a $\nu_R$-philic dark matter (DM) using an effective field theory (EFT) framework. Specifically, we focus on a dimension-6 operator $\overline{\chi}\chi\overline{\nu_R}\nu_R$, where $\nu_R$ represents the right-handed Dirac partner of standard model (SM) neutrinos. In the early Universe, the annihilation...
In this work, we present phenomenological studies of higher order QCD corrections in a simplified model of gluphilic dark matter. The model contains a scalar dark matter (DM) candidate which interacts with standard model (SM) particles via a scalar mediator. In particular we consider quarks and gluons as final state SM particles. At leading order, the annihilation of DM candidates into the SM...
The study of thermalization of heavy flavors (HF) in the Quark Gluon Plasma (QGP) is one of the major physics goals of the upcoming heavy-ion experiments. Heavy flavors are primarily produced by hard scatterings during the early stages of ultra-relativistic hadronic collisions. Their azimuthal angular correlation ($\Delta\varphi$) can be modified at different stages of collisions. Probing the...
The GRAPES-3 experiment in Ooty, Tamil Nadu, operates the world’s largest muon telescope, consisting of 3,776 proportional counters (PRCs) as its primary detectors. These PRCs are cuboidal iron tubes filled with P10 gas, a mixture of 90% Argon and 10% Methane. Each PRC has dimensions of 6mx 0.1m x 0.1m and contains a 100-micron diameter tungsten wire anode, placed exactly at the centre of the...
Micro-Pattern Gas Detectors (MPGDs) are a class of gaseous ionization detectors that involve microelectronics. In the gas-filled medium, anode and cathode electrodes are separated by a small space at large potential differences. Electrons and ions are produced when charged particles interact with the gas medium. With the avalanche mechanism, deflected electrons cause further ionization and the...
Electromagnetic properties of a hadron are analyzed to elucidate the distribution of charge and magnetization within a hadron. Sachs form factors are the fundamental quantities used to study these properties. We have adopted the light-cone formalism to analyze the electric Sachs form factors $G_E(Q^2)$ of strange and non-strange low-lying octet baryons in a diquark spectator model. All...
We investigate thermal dilepton production in heavy-ion collisions using relativistic second-order Israel-Stewart hydrodynamics with Gubser solutions. The Gubser flow considers both the transverse expansion of the medium along with longitudinal boost invariance. We study in detail the temperature and shear stress evolutions of hot QCD medium by varying the associated parameter $q$ of the...
The existence of dark matter has long been extensively studied in the past few decades. In this study, we investigate the emission of neutrinos and photons from neutron stars (NSs) by employing the modified theory of gravity and the corresponding Tolmann-Oppenheimer-Volkoff (TOV) system of equations. The extreme matter densities and magnetic fields inside a NS provide a unique laboratory for...
In this study, we have constructed the inverse potentials for s-wave neutron-proton (n-p) elastic scattering in the 1S0 and 3S1 channels, utilizing a piecewise Morse function as the reference function within the phase equation framework. We have optimized the model parameters of the reference function by minimizing the mean absolute percentage error (MAPE) between the simulated and expected...
The Inert Doublet Model (IDM) is among the most extensively studied frameworks for addressing the mystery of dark matter (DM). We considered here an interesting aspect of compressed spectrum scenario and its implications for DM phenomenology and collider probes. In this context, I will discuss the role of an additional vector-like quark (VLQ) which improves the DM scenario and gives...
The GRAPES-3 experiment, housing the world's largest muon telescope at 2200 m above sea level in Ooty, is designed to study cosmic-ray effects on Earth. To double the telescope's capability, we have refurbished nearly the same number of proportional counters using iron pipes that are over half a century old. Before their utilization, these pipes were almost-buried 2300 meters underground at...
we compare two methods for describing quantum system, using the example of an anharmonic oscillator: the Wigner distribution and the Husimi distribution. These help us to understand a system's information content, especially how it changes with different parameters, like anharmonicity ($\lambda$) and energy levels ($n$). For both distributions, we calculate various information measures such...
The observation of collectivity and traces of deconfinement in high multiplicity pp events produced at LHC energies has drawn considerable attention towards the smaller collision systems, like pp and pPb. Studies involving statistical moments and scaling laws are expected to provide new insights into understanding the production dynamics. After the observation of KNO scaling violation at SPS...
Particle–antiparticle pair creation from a vacuum under the action of a strong electromagnetic(EM) field is one of the most profound phenomena in quantum electrodynamics (QED). The phenomenon of pair creation can be seen as a field-induced phase transition (FIPT) [1,5]. This occurs because the vacuum state evolves over time due to the non-stationary Hamiltonian [7], leading to spontaneous...
In this article, we calculate the $S$-matrix elements for the process $e^{+} e^{-}\rightarrow t \bar{t}$ mediated by Standard Model photon, $Z$ boson and an additional $Z^{'}$ boson indicating the contribution from new physics. We calculate the amplitude square using two component spinor formalism and four component spinor formalism and show the equivalance of the results using the two...
In our recent publications pertaining to 4G model of final unification, we have proposed three assumptions. First assumption is: There exists a weak fermion of rest energy $M_{wf}c^{2} \cong 584.725 \; \rm{GeV}$. Second assumption is: There exists a nuclear charge of magnitude $e_n \cong 2.9464e$. Third assumption is: For the weak, nuclear and electromagnetic interactions, there exists three...
IceCube-Gen2 is a proposed extension to the existing IceCube Neutrino Observatory at the South Pole. Here we study the sensitivity of this future detector to the mass separation of primary cosmic rays, using CORSIKA Monte Carlo simulations of air showers initiated by H, He, O and Fe primaries. IceCube-Gen2 will have mainly three components: an optical array instrumenting ten times the in-ice...
Particle ratio fluctuation is one of the observables which is expected to be enhanced during the phase transition that passes close to the critical point. The investigations involving particle ratio fluctuations may reveal the degrees of freedom of the strongly interacting matter created in heavy-ion collisions. Fluctuations in identified particle ratios, $ [\pi,k] $, $ [\pi,p] $, $ [k,p] $...
The GRAPES-3 tracking muon telescope in Ooty, India, equipped with high angular resolution and statistical precision, records short-term variations in muon intensity during major thunderstorms, termed thunderstorm-induced muon events (TIMEs) [1]. Recent multidisciplinary investigations of TIMEs have examined seasonal variations [2], connections with the global electric circuit [3], climate...
Studying cosmic ray-induced air showers in Earth's atmosphere provides valuable insights into the primary cosmic rays, offering an indirect approach to analysing these high-energy particles. The muonic component in air showers is particularly informative for determining the mass composition of primary cosmic rays, underscoring its significance. Hadronic interaction models, such as EPOS-LHC,...
We investigate the exclusive rare semileptonic decays: $B(B_c)\to K(D_{(s)})l\bar{l}/\Sigma\nu_l\bar{\nu_l}$ ($l=\mu, \tau$) in the framework of relativistic independent quark (RIQ) model based on an average flavor independent confining potential in equally mixed scalar-vector harmonic form. The invariant weak form factors, parametrising the matrix elements between participating meson states...
The recent discovery of the exotic Tcc tetraquark by the LHCb collaboration has garnered significant interest in the particle physics community. Building on this discovery, our research investigates the potential existence of another exotic tetraquark, Tccus, which could be within the reach of LHCb, if it exists. Using lattice QCD, a first-principles approach, we simulate scattering of charm...
To analyze atmospheric pressure effects on muon flux intensity related to meteorological factors over long periods provide valuable insights into the dynamics of space weather and climate change.
This study analyzes the relationship between muon flux and atmospheric conditions, specifically pressure, using data recorded since 2015 with portable detectors. Data have been collected from two...
Filamentary structures in radio galaxies have been known for a few decades. Over the past few years, owing to the high resolution and sensitive images of the radio sky with telescopes such as the LOFAR and the MeerKAT, the number of radio galaxies found to harbor such structures has increased manyfold. ESO 137$-$006 (coordinates 16:15:03.8 $-$60:54:26; J2000) is a luminous radio galaxy as seen...
Here, we explored the Berry’s geometric phases through the Lewis phases. Considering a gravitational wave carrying only plus polarization and interacting with an isotropic two dimensional quantum harmonic oscillator, we showed how the geometric phase which is completely dependent on the gravitational perturbation due to the incoming gravitational wave, can be revealed from the adiabatically...
Data from Coherent Elastic Neutrino-Nucleus Scattering (CE$\nu$NS) and Elastic Neutrino-Electron Scattering (E$\nu$ES) are utilized to constrain "chiral" $U(1)_{X}$ gauge models featuring a light vector mediator. These models represent a unique class of new symmetries known as Dark Hypercharge Symmetries, where the $Z'$ boson couples to all Standard Model fermions at tree level. The $U(1)_X$...
Neutron stars (NS), characterized by strong gravity and extreme density, provide a lucrative place to explore the properties of dark matter (DM) particles. We investigate the DM capture inside the neutron star and report that the DM capture rate enhanced for velocity and momentum-dependent DM-baryon interactions. The accreted DM particles get thermalized, form a gravitationally bound core, and...
The IceCube experiment is a cubic kilometer neutrino observatory at the South Pole which uses an array of Digital Optical Modules (DOMs) deep inside the ice to detect the neutrinos. IceCube has a denser geometry of DOMs at its bottom central region known as DeepCore which enables it to detect GeV energy atmospheric neutrinos. DeepCore provides a unique avenue to explore various tiny Beyond the...
The interactions in electron-proton collisions is dominated by the interaction of real photons emitted by the electrons with the protons. The presence of multiple parton interactions has been already established in such collisions at HERA energies and it plays a vital role in exploring dynamics of hadronic final state production in photon-proton interactions. The present work reports the...
Experimental observation on neutrino oscillation confirms the fact that neutrinos have non-zero mass. Thus, there is a possibility of decaying heavy neutrinos to lighter one. Additionally, due to some external factors (like environmental interactions, quantum mechanical uncertainty, quantum fluctuations etc.), the quantum phases between the neutrino mass eigenstates lose their correlation,...
Sterile neutrinos, non-interacting fermion singlets, are crucial in BSM physics, addressing oscillation anomalies and facilitating neutrino mass generation via type-I seesaw mechanism. We investigate a model extending the SM with 3 sterile neutrino states, employing a specific $(6\times6)$ unitary mixing matrix. Analytically deriving the masses of added sterile states using the exact seesaw...
In today's precise age of neutrino physics, non-standard interactions (NSI) and other subdominant new physics scenarios are highly intriguing for delving into physics beyond the standard model (BSM). The study of scalar NSI (SNSI), which is mediated by a scalar field, has been an intriguing topic of interest in the recent years. In contrast to vector NSI, SNSI alters the standard neutrino mass...
Event shape variables are crucial in high-energy physics for characterizing the geometric and kinematic properties of particle collision events. These variables help to understand the underlying dynamics of the interactions that produce different particles and can provide insights into the nature of the forces involved.
This work presents calculations of event-shape observables,...
Precision measurements of charged lepton dipole moments provide valuable insights into physics beyond the Standard Model. We explore the parameter spaces of TeV-scale vector leptoquarks (LQs) relevant to these observables, focusing on the magnetic moment discrepancy $(a_\mu^{\rm exp} - a_\mu^{\rm SM})$ and constraints from the LHC. Our analysis shows that only the $U_1$ and $V_2$ LQ models can...
In curved spacetime, neutrinos experience an extra contribution to their effective Hamiltonian coming from a torsion-induced four-fermion interaction that is diagonal in mass basis and also causes neutrino mixing while propagating through fermionic matter. This geometrical quartic interaction term appears as the modification to the neutrino mass and significantly influences both neutrino...
We explore the influence of interactions between dark matter and dark energy on the cosmic evolution of the Universe within a viscous dark energy (VDE) framework. Moving beyond traditional interacting dark energy (IDE) models, we propose a generalized IDE model adaptable to diverse IDE scenarios via IDE coupling parameters. In order to investigate deviations from $\Lambda$CDM across cosmic...
Axion-like particles (ALPs) are predicted by various extensions of the Standard Model, such as composite models, and are potential candidates for new physics. We investigate the production of ALPs at the LHC (14 TeV) through a Z boson decay, where the Z boson couples to an axion and a photon. We further decay the axion into two bottom quarks, resulting in a distinct final state consisting of...
Coherent Elastic Neutrino Nucleus Scattering (CE$\nu$NS) offers exciting opportunities to probe new physics within and beyond the Standard Model. The process occurs when the scattering amplitudes of nucleons interfere constructively, leading to the scattering of the entire nucleus. Detecting CE$\nu$NS provides deeper insights into neutrino properties, such as the neutrino magnetic moment,...
Particle–antiparticle pair creation from a vacuum under the action of a strong electromagnetic (EM) field is one of the most profound phenomena in quantum electrodynamics (QED). This phenomenon of pair creation can be seen as a field-induced phase transition (FIPT) [1,5]. This occurs because the vacuum state evolves over time due to the non-stationary Hamiltonian [7], leading to spontaneous...
Hardware and firmware development work at TIFR for CMS L1 Trigger
The CMS muon system is being upgraded with the GE1/1 station of Gas Electron Multiplier (GEM) detectors to handle the increased muon flux in the very forward eta region. This work analyzes muon detection efficiency with the GE1/1 station using p-p collision data with center of mass energy of 13.6 TeV. A dataset enriched with muons from Z-decay, with a total integrated luminosity of ~ 6 fb−1,...
This work explores a simplified dark matter (DM) model featuring a spin-0 mediator with masses below 10 GeV. The parameter space is systematically divided into various mediator mass regions, and model constraints are derived using a diverse array of observables. These include flavour-changing charged and neutral current processes, rare and semileptonic decays of pseudoscalar mesons,...
We review the well-known Hellmann Feynman Theorem [1], originally developed for Hermitian systems to facilitate the calculation of forces among the molecules. Our work extends this foundational theorem to the domain of non-Hermitian quantum mechanics, in particular the PT symmetric non-Hermitian quantum physics [2]. We derive a modified form of the HFT which holds good for both PT broken,...
Worldwide, there is significant ongoing research dedicated to the experimental search for neutrinoless double beta decay (0$\nu\beta\beta$). The reason lies in the fact that the most sensitive experimental avenue to determine if neutrinos are Majorana particles is through the search for 0$\nu\beta\beta$, which further offers insights into the absolute mass scale of neutrinos and the mechanism...
We obtain the various forms of BRST symmetry by using the Batalin-Fradkin-Vilkovisky formalism in a prototypical first class system. We have shown that the various forms of symmetry can be obtained through canonical transformation in the ghost sector. The BRST symmetries have also been discussed in configuration space. The so called "dual-BRST" symmetry which is claimed to be an independent...
Inspired by the recent discovery of the fully charm tetraquark state $X(6900)$, this study examines the properties of fully heavy tetraquark and pentaquark states. Using the flux tube model with finite quark masses, we analyze the Regge trajectories of these states, which are found to be highly non-linear. Additionally, the estimated masses of these multiquark hadrons are compared with...
Vector-like leptons (VLLs) are hypothetical heavy partners of Standard Model (SM) leptons and are present in many extensions of the SM. In specific quark-lepton unification theories, VLLs coexist with leptoquarks (LQs), another proposed colored particle that connects the quark and lepton sectors. Because VLLs are color-neutral particles, their production is primarily governed by weak...
The European Spallation Source (ESS), under development in Sweden, is set to provide a high-intensity pulsed neutrino beam, offering unprecedented opportunities for high-statistics studies of Coherent Elastic Neutrino-Nucleus Scattering (CE$\nu$NS) using state-of-the-art detection technologies. The anticipated statistical reach and precision at ESS will enable us to probe both Standard Model...
We study the Gamma Ray light curves which occur from magnetic reconnection in cosmic string wakes. As the string moves, the reconnection points in the cosmic string wake give rise to shocks with relativistic velocities. Since the shock waves arise from different points of magnetic reconnections, they have different velocties and therefore different relativistic gamma factors. As the shocks...
The Gas Electron Multiplier(GEM) detector is one of the most important Micro-Pattern Gaseous Detector (MPGD) first introduced in 1997 by F. Sauli at CERN. These detectors utilize the principle of gas ionization, where an incoming particle interacts with the gas,ionizing it and creating electron-ion pairs. The core of the GEM detector is the GEM foil, a thin insulating layer (usually made of...
The High-Luminosity upgrade of the Large Hadron Collider (HL-LHC) introduces new challenges for experiments like CMS by substantially increasing the collision rate. This intensified luminosity will particularly affect the forward regions of the CMS detector, where particle flux will be most intense. To meet this challenge, CMS is deploying new Gas Electron Multiplier (GEM) stations—GE1/1,...
In this study, we constryuct and analyse SU(N) gauge theory in quantized space-time. Starting from $\kappa$-deformed Wong's equation and using Jacobi identities involving the $\kappa$-deformed space-time coordiantes and velocities, we derive the Yang-Mills equation.
Resistive Plate Chambers (RPCs) play a vital role in high-energy physics experiments, offering excellent particle detection efficiency and time resolution across large areas. Usually, Freon-based gas mixtures facilitate these performance attributes but pose significant environmental concerns due to their high Global Warming Potential (GWP). In light of growing ecological awareness and stricter...
In this work, we propose a model of the gravitational collapse of dark matter in the presence of a minimally and nonminimally coupled scalar field, which is used to model quintessence and phantom-like dark energy. We focus on algebraic coupling, where the interaction Lagrangian is independent of the derivatives of the scalar field. Our treatment is based on the principles of general relativity...
Despite having important cosmological implications, the reheating phase is believed to play a crucial role in both cosmology and particle physics model building. Conventional reheating models primarily rely on arbitrary coupling between the inflaton and massless fields, which lacks robust predictions. In this article, we propose a novel reheating mechanism where the particle physics model,...
We investigate the implications of memory burden on the gravitational wave (GW) spectrum arising from the Hawking evaporation of light primordial black holes (PBHs). By considering both rotating (Kerr) and non-rotating (Schwarzschild) PBHs, we demonstrate that the overproduction of primordial GWs from burdened PBHs could impose stringent constraints on the parameters governing backreaction...
Gravitational waves (GWs) have recently emerged as a crucial tool for investigating unresolved cosmological phenomena. A key finding from our study is the discovery of speed variations for GWs predicted by the Horndeski action, which extends our understanding beyond simpler models such as $f(R)$ gravity and Brans-Dicke theory. These variations arise from the Weyl curvature tensor, which...
The physics regarding the existence and exact position of the critical end point (CEP) on the quantum chromodynamics (QCD) phase boundary is ambiguous and remains an open question. In this work, we have used a hadron resonance gas (HRG) model that incorporates finite-sized baryons, antibaryons, and mesons. This hard-core radius (\textit{r}) plays a crucial role in the existence of the CEP. We...
Belle II provides an excellent environment to study missing energy modes. These studies need a complete reconstruction of one of the two B mesons produced in the collision. Belle II has a dedicated algorithm called Full Event Interpretation(FEI) for reconstructing a $B$ meson. FEI follows a hierarchical approach employing multivariate analysis at each stage to reconstruct the exclusive $B$...
We have witnessed several experimental identifications of the heavy hadrons in the past few years. Several experimental facilities have observed many excited states of singly, doubly, and triply heavy baryons. The incredible experimental progress sparked theoretical investigations into the physics of heavy baryons. Theoretical research primarily focuses on understanding heavy baryons' mass,...
In the current work, We calculate the heavy quark (charm and bottom) energy loss due to elastic collisions and gluon radiation in proton-Lead (pPb) collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV. We use the Peigne and Peshier formalism to calculate the collisional energy loss and generalised dead cone approach and DGLV formalism to calculate the radiative energy loss. We also calculate the...
The possibility of a Higgs-Higgs bound state in the two Higgs doublet model is investigated . Specifically we look for the effect of dimension six operators, generated by new physics at a scale of a few TeV, on the self-couplings of the heavy CP even scalar field in the model. We construct an effective field theory formalism to examine the physics of the Higgs sector. The magnitudes of the...
The High-Luminosity Upgrade of the Large Hadron Collider (HL-LHC) aims to boost luminosity to approximately in the range of 5 x $10^{34}$ $cm^{-2}$ $s^{-1}$ to 7 x $10^{34}$ $cm^{-2}$ $s^{-1}$, significantly increasing the discovery potential of its detector system. In the CMS detector, particularly in the muon spectrometer, upgrades are essential to manage the higher Level-1 muon trigger...
Driven Conformal Field Theories (CFTs), where Hamiltonians alternate periodically (Floquet CFTs) or change abruptly (Quench), have emerged as a versatile platform for exploring non-equilibrium phenomena in soluble systems. We investigate the holographic dual of a large $c$ CFT in two-dimensions, initialized in a thermal state and subject to a generic deformation by $SL^{(q)}(2,R)$ generators....
The ICARUS collaboration employed the 760-ton T600 detector in a successful three-year physics run at the underground Gran Sasso National Laboratory (LNGS), performing a sensitive search for LSND-like anomalous $\nu_e$ appearance in the CERN Neutrino to Gran Sasso beam. This contributed to the constraints on the allowed neutrino oscillation parameters to a narrow region around 1 $eV^2$. After...
The Future Circular Collider (FCC) study is developing designs for high-performance particle colliders to potentially follow the Large Hadron Collider (LHC) at CERN after its High-Luminosity phase. The plans include a 90.7 km tunnel at an average depth of 200 m, with eight surface sites supporting up to four experiments. The IDEA (Innovative Detector for Electron–positron Accelerator) has been...
Imaging methods based on the absorption or scattering of atmospheric muons, collectively called “muon tomography” have many potential applications. Study of identification of Nuclear waste using multiple Coulomb scattering of cosmic ray muons is presented. Scattering angles for different radioactive materials used as fuel in nuclear reactors in India.
How can Cosmic ray muons be used to...
A fundamental length scale is a key feature of all quantum gravity theories, and non-commutative space-time provides a pathway to incorporate this length scale naturally in the theory. In our study, we investigate the geodesic motion of a test particle around a Schwarzschild black hole in a specific non-commutative space-time ($\kappa$-deformed space-time). We compute a modified Lagrangian to...
This research explores the combined effects of dark matter (DM) and rotation on the structural and dynamical properties of neutron stars (NSs). Utilizing a self-interacting dark matter model inspired by the neutron decay anomaly, the study integrates DM within the relativistic mean-field (RMF) framework, modeling static and rotating NSs to observe the impact of varying DM interaction strengths...
Lorentz invariance violation (LIV) is a significant factor that can influence the determination of standard unknown oscillation parameters in neutrino physics. This study examines how non-isotropic LIV, particularly with sidereal effects, impacts neutrino oscillation dynamics in the Deep Underground Neutrino Experiment (DUNE). Our analysis reveals that LIV presents considerable challenges in...
Electromagnetic properties serves as a powerful tool for unraveling the internal composition of hadrons, emphasizing the crucial role of sea quarks and gluons in shaping their dynamics. In the present work, we investigated the transition quadrupole moment ($ \Delta^{0}\rightarrow N$) using the statistical framework, incorporating the detailed balanced principle. The expansion of hadrons...
Recent collider’s results in $B$ meson decays introduce some disagreement with the SM predictions. The LHCb results for the total branching fractions $Br(B →K\mu^+ \mu^-)$, $Br(B_s→\phi\mu^+ \mu^-)$ and the angular observable $P_5^{\prime}$ of $B_s→K^{\star} \mu^+ \mu^-$ decay, which are governed by the flavour changing neutral current (FCNC) $b→s\mu^+ \mu^-$ transition, show inconsistencies...
We explore the implications of unbroken symmetries at the self-dual point $\tau = i$ within the framework of modular invariant theories. Assuming that lepton doublets transform under a finite modular group and that light neutrino masses stem from the Weinberg operator expressed in modular form, we identify a distinct residual flavor symmetry for neutrinos that depends on the modular weight. In...
In the presence of non-standard interaction (NSI), the solar neutrino problem has two solutions, one is for standard Large Mixing Angle (LMA) with solution $\sin^2θ_{12}$ = 0.3 and other is $\sin^2θ_{12}$ = 0.7. The latter is known as the Dark-Large Mixing Angle (D-LMA) solution. In this work, we have investigated the one zero texture and vanishing trace of inverse neutrino mass matrix in the...
In this work, we study the (co-)annihilation dynamics and lepton flavor violation (LFV) in the context of fermionic dark matter within the Scotogenic model, assuming trimaximal mixing (TM$_2$) nature for neutrino mixing matrix. TM$_2$ mixing matrix is used to parameterize the complex Yukawa coupling matrix. Our objective is to identify the parameter space that simultaneously satisfies data...
Leptoquarks (LQs) offer a promising framework for exploring physics beyond the Standard Model (BSM). These particles, inspired by higher gauge theories like Pati-Salam and Grand Unified Theories, are currently being probed at the LHC, primarily through pair production (PP). Our study improves the LHC exclusion limits by including additional production modes like single productions, t-channel...
The present and future detector systems in High Energy Physics (HEP) require fast timing, improved spatial measurements and good signal-to-noise ratio (SNR). This prompted the development of Low Gain Avalanche Detectors (LGADs) as an attractive alternative for replacing traditional silicon sensors for 4D tracking purposes. As fast timing necessitates thin sensors, the use of thin LGADs for...
This research investigates the influence of dense non-strange resonance matter, consisting of nucleons and delta baryons (Δ⁺⁺, Δ⁺, Δ⁰, and Δ⁻), on the masses of scalar D mesons (D₀⁺, D₀⁰) under finite temperature conditions.The modifications of the above mesons in this medium arise from changes in the quark and gluon condensates. Using the chiral SU(3) mean-field model, we obtain the in-medium...
In this study, We first obtain the effect of density of medium on modifying masses of baryons using relativistic potential model. Using this medium modified mass which enables us to calculate the medium dependent nuclear properties- such as charge radius, magnetic moment and axial vector. These obtained in-medium properties of baryons are helpful in understanding matter under extreme...
The influence of fermion vacuum fluctuations on the thermodynamic properties of strongly interacting quark matter is examined within a finite volume Polyakov chiral SU(3) quark mean field (PCQMF) model at finite temperatures and chemical potentials. A lower momentum cutoff is used to introduce finite volume effects to investigate scaled thermodynamic quantities: pressure $p/T^4$, energy...
Inclusive-jet photoproduction at HERA has shown to be a favorable ground for verifying perturbative QCD with the obtained jet cross-section. Monte-carlo event generator PYTHIA8 is used to compare the data of ZEUS collaboration aiming for high precision measurements of $\alpha_s$ at HERA. Inclusive-jet photoproduction in the reaction $e^++p \rightarrow e^++jet+X$ with beam energies $E_p$ = 920...
Several astrophysical and cosmological observations suggest the existence of dark matter (DM) through its gravitational effects, yet its nature remains elusive. Despite the lack of DM signals from direct detection experiments, efforts continue to focus on the indirect detection of DM from massive astrophysical objects. Dwarf spheroidal galaxies (dSphs) are among the most promising targets for...
We have estimated the induced electric field in quark-gluon plasma (QGP) due to its thermoelectric effects. At present, the relativistic heavy-ion collisions are capable of creating QGP, a locally thermalized medium composed of quarks and gluons.
During the space-time evolution of the QGP medium, interesting thermoelectric phenomena occur due to the presence of electrically charged particles...
In this study, we investigate the influence of the noncommutativity on the centripetal force on a rotating Casimir apparatus in $\kappa$-deformed space-time. We set up the Casimir apparatus rotating with constant angular speed using appropriate $\kappa$-deformed coordinates. We compute the $\kappa$-deformed centripetal force on the Casimir energy associated with parallel plates. We show that...
We study thermal and non-thermal resonant leptogenesis in a general setting where a heavy scalar $\phi$ decays to right-handed neutrinos (RHNs) whose further out-of-equilibrium decay generates the required lepton asymmetry. Domination of the energy budget of the Universe by the $\phi$ or the RHNs alters the evolution history of the primordial gravitational waves (PGW) of inflationary origin,...
The quantum chromodynamics (QCD) like framework of the renormalized Polyakov quark-meson (RPQM) model has been obtained after combining the exact chiral effective potential of the two flavor renormalized quark meson (RQM) model with the improved Polyakov-loop potential that accounts for the quark back reaction. The consistent treatment of the quark one-loop vacuum fluctuations and the...
In various extensions of the Standard Model (SM) that incorporate an additional
U(1)′ gauge symmetry, the dark photon (A′) emerges as a compelling candidate
for dark matter. This hypothetical particle can interact with Standard Model par-
ticles via kinetic mixing with the standard photon, thus serving as a potential
portal to the dark sector. Theoretical interest in dark photons is driven...
An exact analytical solution to the nonlinear Balitsky-Kovchegov equation is proposed, requiring very few parameters to describe the nonlinearity of gluon evolution. Using this solution, along with the concept of color glass condensate, we achieve a good description of RHIC and LHC data on differential yields for d-Au, p-p, and p-Pb collisions. Quantitative predictions for nuclear modification...
The textures in the neutrino mass matrix refer to specific patterns and structures, these textures have the ability to constrain various neutrino parameters such as mixing angles, Dirac and Majorana phases, and mass eigenstates. In this work, we investigate one zero texture within the framework of generalized CP symmetry associated with the complex tribimaximal matrix. The generalized CP...
Correlations among net-conserved quantities such as net-baryon, net-charge, and net-strangeness play a crucial role in studying the QCD phase structure, as they are directly related to thermodynamic susceptibility ratios in lattice QCD (LQCD) calculations. Recent LQCD studies indicate a significant influence of the magnetic field ($eB$) on the susceptibility ratio associated with...
One of the major motivations for the planned p--O and O--O collisions at the LHC is to explore the possibilities of small system collectivity. Such transverse collective expansion results in the appearance of long-range azimuthal correlation and is quantified via the coefficients, $v_{\rm n}$, of Fourier expansion of the azimuthal momentum distribution of the final-state particles. These flow...
Hadronic resonances, with lifetimes comparable to the duration of the hadronic phase, can be used as effective probes for studying its evolution in heavy-ion collisions. Exploring the dynamics of the hadronic phase reveals the roles of rescattering and regeneration in resonance production. In particular, rescattering reduces the resonance yields and may alter their transverse momentum, while...
In this study, we aim to understand the interactions that govern hadronic molecules. To calculate the mass spectra, we use a One Boson Exchange potential combined with a Yukawa-like screened potential for their relative s-wave state. We propose that two color-neutral hadrons interact through a dipole-like interaction, resulting in the formation of a hadronic molecule. To differentiate these...
This work investigates the mass spectra of fully strange tetraquarks ($ss\bar{s}\bar{s}$) using Regge Phenomenology, modeling these tetraquarks as diquark-antidiquark pairs. We employ a quasi-linear Regge trajectory ansatz in the $(𝐽,𝑀^2)$ plane, where J represents the total angular momentum, and 𝑀 denotes the mass. By focusing exclusively on strange quarks, we derive relations for the...
The CBM experiment will investigate strongly interacting matter at high baryon density and moderate temperature. One of proposed key observable is the measurement of low mass vector mesons(LMVMs), which can be detected via their di-lepton decay channel.
The experimental challenge for muon measurements in heavy-ion collisions at FAIR energies is to identify low-momentum muons in an environment...
High-energy proton-proton (pp) collisions at the Large Hadron Collider (LHC) produce a variety of subatomic particles. Charged particle multiplicity (Nch) is a key observable in hadronic collisions, offering insight into particle production mechanisms and the hadronization process. Partonic interactions such as Multi-Parton Interactions (MPI), Initial State Radiation (ISR), Final State...
The discovery of non-zero neutrino masses has triggered intensive studies on nontrivial electromagnetic properties of neutrinos, which emerge from electroweak radiative corrections. Despite numerous experimental efforts to detect neutrino electromagnetic interactions, no conclusive evidence has yet been observed. These interactions are characterized by different energy dependencies: the...
In proton-proton (pp) interactions at high energies, the shape of an event—defined by the distribution of particle momenta—is an effective tool for probing the underlying event topology. This study looks at event shape observables, namely transverse sphericity, sphericity, aplanerity etc. to see how they vary with the jet production. We use PYTHIA simulations to assess pp collision data at...
The forward-backward multiplicity correlations between particles produced at different pseudorapidities provide valuable insights into the underlying dynamics of multi-particle production in high-energy collisions. These correlations, believed to be largely unaffected by final-state effects, offer a unique window into the initial stages of the collision. This study investigates the correlation...
In the present work, we measured the response of the EJ-315 liquid organic scintillator to gamma rays. The EJ-315 detector was calibrated using Compton edges obtained from standard gamma sources, the calibration accuracy verified through Monte Carlo simulations. To facilitate gamma spectra unfolding, a response matrix was calculated using GEANT4, and a procedure was developed to determine the...
The quenching factor is a crucial parameter for accurately analyzing nuclear recoil data in dark matter searches, as well as in neutron and coherent neutrino scattering experiments. In this study, we investigate nuclear and electronic stopping powers in self-irradiated silicon and germanium matrices to understand energy loss behaviors. Using the LAMMPS molecular dynamics package with a (3x3x3...
We study circular orbits of charged particles in spherically symmetric AdS black holes in general higher derivative theories of gravity in arbitrary dimensions, and their limiting ISCOs (innermost stable circular orbits). The dual interpretation is in terms of heavy-light double twist conformal field theory (CFT) operators in the large spin limit, whose anomalous dimensions can be extracted...
In high-energy collisions, understanding the contribution of hard gluon Bremsstrahlung is crucial for accurate particle interaction modeling. This study investigates the mechanisms by which hard gluon emissions influence the overall event structure and multiplicity distributions. By employing advanced simulation techniques and event generators, we systematically isolate the effects of hard...
Isospin analysis of Cabibbo suppressed two body weak hadronic decays of Bottom Mesons
Harpreet Kaur Brar* and Maninder Kaur ${ }^{\dagger}$
Department of Physics, Punjabi University, Patiala-147002, India.
The weak interactions in the heavy flavor sector are not yet fully understood, though the standard model...
Background: The study of pion-nucleon scattering is essential in particle and nuclear physics due to the complexities introduced by strong interactions and isospin-dependent dynamics. The analysis of pion-nucleon scattering provides insights into resonance behavior and the underlying forces between pions and nucleons.
Purpose: In this work, we construct inverse potentials for pion-nucleon...
The study presents a generic approach that deals with jet constituents to derive the jet energy scale (JES) uncertainty. It uses single-particle E/p response measurements obtained from 13 TeV Run 2 LHC data from proton-proton collisions. The E/p method offers a higher precision level than the traditional pT-balance method, but it is in good agreement with it. Both methods are combined to...
In the present work, we investigated the impact of finite density of nuclear medium on the electromagnetic properties of kaons and antikaons. We employed the combined approach of chiral SU(3) quark mean field (CQMF) model and light cone quark model (LCQM). In the LCQM, the properties of kaons, for example, weak decay constant, distribution amplitude (DA) and parton distribution functions...
Despite being stable or long-lived on cosmological scales, dark matter (DM) can decay in the early Universe due to finite-temperature effects. In particular, a first-order phase transition (FOPT) during this period can create a finite window for such decay, ensuring DM stability at lower temperatures, consistent with observations. The FOPT may also produce stochastic gravitational waves (GW)...
NOvA, is a two-detector, long-baseline neutrino oscillation experiment located at Fermilab, Batavia, IL, USA. The NOvA experiment was designed primarily to constrain neutrino oscillation parameters by analyzing $\nu_\mu (\bar{\nu}_\mu)$ disappearance and $\nu_e (\bar{\nu}_e)$ appearance data observed at the far detector. The Neutrinos at Main Injector (NuMI) beamline at Fermilab provides a...
Baryons and mesons (collectively referred to as hadrons) have been
understood as quark-gluon composite states bound by Quantum ChromoDynamics (QCD), the theory of strong interactions. The conventional understanding is that baryons are made of three quarks and mesons are composed of a quark-antiquark pair. QCD also supports the existence of more complex hadrons, made of more than three...
Quarkonia, the bound states of heavy quark-antiquark pairs, is an imortant probe for studying the quark-gluon plasma (QGP). We investigate the fate of in-medium quarkonia bound states in the QGP by studyng their spectral functions from lattice QCD. Specifically, we study the quarkonia correlators in the pseudoscalar and vector channels at temperatures $1.2T_{pc}$, $1.4T_{pc}$, and $1.6T_{pc}$....
We propose extending the minimal scotogenic model with a triplet fermion and a singlet scalar. All the fields change non-trivially under an additional $Z_{4}\times Z_{2}$ symmetry. The $Z_{4}\times Z_{2}$ symmetry allows only diagonal Yukawa couplings among different generations of SM leptons and right-handed singlet neutrinos. The one-loop radiative diagrams generate neutrino mass. The Yukawa...
The rare decays $K \to \pi \nu \bar \nu$ are crucial for exploring physics beyond the Standard Model. Our investigation focuses on these decays in the context of leptoquarks, exploring both lepton flavor conserving and violating channels. Furthermore, we explore the potential to detect lepton number violating operators in $K \to \pi \nu \bar \nu$ decays.
We present an improved evaluation of the two-photon exchange correction to lepton proton scattering using heavy baryon chiral perturbation theory at next-to-leading order using elastic intermediate state and adhering to soft photon approximation. A more systematic approach is applied to the loop integrations, eliminating some of the crude approximations from previous work.
We explore the potential of light calorimetry in liquid argon time projection chambers (LArTPCs) and its intrinsic self-compensation properties, highlighting its merits alongside established charge calorimetry. We find that light calorimetry can achieve energy resolution on par with advanced charge-based methods, utilising GeV neutrinos as a benchmark. We also examine how the independent use...
In this talk, I will present some exact results in supersymmetric QCD involving a light neutral chiral superfield. Using symmetry arguments, I will derive the exact low-energy superpotential, which describes the interactions between mesons and the additional scalar and pseudoscalar components of the neutral chiral superfield. The low-energy effective scalar potential will be determined under...
This study connects low and high-energy CP violations within the biunitary parametrization framework, examining their correlations to bridge theoretical predictions and experimental observations. Through biunitary parametrization, low-energy observables are expressed in terms of high-energy parameters, and qualitative and quantitative analyses are conducted. Constraints from neutrinoless...
Rare baryonic decays induced by flavour changing neutral current (FCNC) have been of immense interest in recent years because of their sensitivities towards new physics (NP) beyond the standard model (SM). The exploration had been triggered with the observation of $b→sll$ transition at the Fermilab [1] and the LHCb [2]. Theoretically these decays are also studied at different NP models [3-5]....
In a canonical type-I seesaw scenario, the SM is extended with three singlet right-handed neutrinos (RHNs) $N_i, i=1,2,3$ with masses $M_i, i=1,2,3$ to simultaneously explain sub-eV masses of light neutrinos and baryon asymmetry of the Universe. In this paper, we show that a relatively low-scale thermal leptogenesis accompanied by gravitational wave signatures is possible when the type-I...
We study an SU(N) matrix model with a Gross-Witten-Wadia weight function and a low-temperature fermionic term at finite chemical potential. We provide exact results for several physical quantities in the large N limit in the confined phase, such as (density of eigenvalues), free energy, and winding Wilson loops. As expected, this model exhibits the sign problem.
The magnetic moment of the $\Sigma^{0}_{b}$ baryon provides critical insights into the underlying quark dynamics and interactions within heavy-flavor baryons. Previous studies have calculated the valence quark contributions using theoretical models. In this work, we employ the chiral SU(3) quark mean field model for the first time to calculate the magnetic moment of the $\Sigma^{0}_{b}$...
In this study we have investigated the magnetic moments of octet baryons by examining
the direct impact of external magnetic fields on their constituent quarks. Strong
external magnetic fields can influence chiral symmetry breaking or its restoration, leading
to changes in effective quark masses. We have calculated the effective masses of constituent
quarks and the octet baryons in the...
We extend the potential reconstruction technique to establish a dynamical Einstein-Born-Infeld-dilaton model, which serves as a framework for investigating the melting of holographic quarkonium under an applied magnetic field. The model’s non-linearity enables the magnetic field to interact directly with the quarkonium's internal structure, bypassing the need to introduce charged flavor...
It is well-known that within the standard three flavor neutrino oscillation formalism, the Majorana phases appearing in the neutrino mixing matrix cannot have any effect on neutrino oscillation probabilities thereby evading testability at neutrino oscillation experiments. We consider an effective non-Hermitian Hamiltonian describing three flavor neutrino oscillations with the possibility of...
The MALTA sensor is an advanced monolithic pixel detector created to withstand the rigorous conditions of high-energy physics experiments, like those at the Large Hadron Collider (LHC). Unlike conventional pixel sensors that rely on separate readout electronics, MALTA combines the sensor and readout circuitry on a single silicon wafer. This integrated monolithic design increases compactness,...
In this investigation, we calculate the in-medium mass of $\phi$ meson in hot and dense non-strange resonance matter using the effective Lagrangian framework for $\phi K \bar K$ interactions at one loop level. The mean-field effective approach is utilized within the chiral SU(3) hadronic mean-field model to incorporate medium modification of kaon-antikaon masses. we have considered nucleons...
In this study, we investigate the properties of the doubly heavy baryon Ξ_bb using the Hyper Central Constituent Quark Model (hCQM). Our calculations yield the masses of both ground and excited states of Ξ_bb, incorporating higher-order corrections, including second-order mass corrections within spin-dependent terms. This approach enables precise determination of spin splitting. We determine...
In this work, we estimate the mass spectra and decay properties of heavy quarkonia, specifically bottomonium ($b \bar b$), using a non-relativistic potential model. We employ a potential model incorporating a Coulomb like term $(-1/r)$, representing one gluon exchange at short distances, and a confining term ($\sqrt{r}$), representing quark confinement at long distances. Spin dependent...
This study explores the mass-radius relationship of oblate spheroidal magnetized white dwarfs within the parameterized γ-metric formalism. A relativistic free Fermi gas of electrons embedded in strong Landau quantizing magnetic fields at absolute zero temperature is considered. Due to the anisotropy in the pressures parallel and perpendicular to the direction of the magnetic field, these...
Muon Scattering Tomography (MST) is an effective technique for identifying special nuclear materials (SNM) in cargo transporting across borders, posing a significant threat to homeland security. Images of SNM and other materials in cargo can be produced on the basis of scattering suffered by cosmic mons while passing through the objects. The magnitude of scattering is known to be dependent...
A $SU(2)$ gauge theory coupled to the fermions transforming in the adjoint representation has many intriguing features. With Weyl fermions of two flavors, the system has $SU(2)_B \times U(1)_A$ global symmetry [1]. In this model of 2-color 2-flavor adjoint-QCD, there is a long-standing debate whether the low-energy dynamics is confining with spontaneously broken $SU(2)_B$ (this...
Event-by-event fluctuations in the mean transverse momentum (Event-by-event fluctuations in the mean transverse momentum ($p_{\rm T}$) of charged particles produced in high-energy proton-proton (pp) collisions are investigated. High-multiplicity data at $\sqrt{s}$ = 13 TeV collected by ALICE is analyzed for this purpose. The mean $p_{\rm T}$ fluctuations are studied in terms of the...
The angular analysis of the rare decay Bs0 → phi mu mu is performed in bins of squared dimuon invariant mass (q2), using an integrated luminosity of 137.5 fb-1 of data collected by the CMS detector at center-of-mass energy, √s = 13 TeV. The CP asymmetry (A6) and CP averaged (FL) angular observables are measured to be in agreement with the Standard Model prediction in the low q2 region 1.1-6.0...
We present the two body decay of $B^+ \rightarrow D_s^{*+} \bar{D}^0$ that can help us improve our understanding of heavy quark dynamics, hadronic interactions. These decays also help in refining our experimental knowledge in flavor physics. The study is performed using 1$\text{ab}^{-1}$ of Belle II simulated $e^+e^-$ collision data at $\Upsilon(4S)$ mass resonance. Instead of reconstructing...
The $B^0 \rightarrow K_S^0 \pi^0$ decay is dominated by $b \rightarrow s$ loop amplitudes. Such flavor-changing-neutral current transitions are highly suppressed in the Standard Model and provide an indirect route to search for new physics. This channel is an important cog in the so-called "K\pi puzzle," where the amplitudes of the four $B \rightarrow K\pi$ decays—two neutral modes and two...
We present preliminary MC results from a search for the decay $B^+ \to K^{*+}\omega$ using the data collected by the Belle II detector at the SuperKEKB asymmetric-energy $e^+e^-$ collider, operating at the $\Upsilon(4S)$ resonance. This analysis focuses on the decay of $B$ meson into two non-leptonic charmless vector mesons. The production of vector mesons in different polarization states...
In top quark pair production, interference between the tree-level and box diagrams, along with interference between initial-state and final-state radiation in quark-initiated processes, induces an asymmetry in the angular distribution of the resulting top and anti-top quarks. Several observables have been proposed in the literature to quantify this asymmetry, including the Forward-Backward...
The top quark pair production ($t\bar{t}$) is an extremely vital process as that constitutes a major background for many new physics searches. Although it is a well-understood process, CMS and ATLAS experiments have reported a difference in the top quark momentum spectrum compared to theoretical predictions, particularly at large transverse momentum. We are measuring $t\bar{t}$ production...
Measurements of the anomalous magnetic moment of leptons provide stringent tests of the Standard Model and hints of physics beyond the Standard Model. These measurements for electrons and muons are among the most precisely measured quantities in physics. However, due to the short lifetime of the tau lepton, its anomalous magnetic moment cannot be determined through precession measurements. We...
The W boson mass is measured using proton-proton collision data at $\sqrt s=13$ TeV corresponding to an integrated luminosity of 16.8 fb$^{-1}$ recorded during 2016 by the CMS experiment. The W boson mass is extracted using single-muon events via a highly granular maximum likelihood fit of the transverse momentum, pseudorapidity, and charge distribution of the selected muons, yielding one of...
We will present the recent measurements of opposite-sign WW production cross-section in proton-proton collisions at a center-of-mass energy of 13.6 TeV. The data used were collected by the CMS experiment in 2022 during Run3 of the LHC, corresponding to an integrated luminosity of 34.8 fb-1. The events were selected using leptonic decay channel by requiring one electron and one muon of opposite...
The inclusive WZ production cross section is measured in proton-proton collisions at a center-of-mass energy of 13.6 TeV, using 34.7 fb$^{−1}$ of data recorded in 2022 with the CMS detector at the LHC. This analysis focuses on multileptonic final states and uses a simultaneous likelihood fit to the number of events in four different lepton categories. The WZ process is sensitive to triple...
A measurement of inclusive and differential fiducial cross-sections for the production of the Higgs boson decaying into two photons is performed using 34.7 fb−1 of proton-proton collision data recorded at √s = 13.6 TeV by the CMS experiment at the Large Hadron Collider in 2022. The inclusive cross-section in a fiducial region closely matching the experimental selection, is measured to be 78 ±...
Two-particle femtoscopy is a powerful technique for investigating both the emission source and the interaction potentials between particle pairs. The primary observable in femtoscopy is the two-particle correlation function, which provides crucial insights into the space-time characteristics of the emitting source, as well as the effects of final-state interactions. By analyzing correlations...
Abstract:
A cylindrical threshold Cherenkov detector has been designed and fabricated at the TIFR to determine the shape of the differential cosmic muon flux spectrum at the low energy ranges, which is the dominant component at the earth’s surface. This Cherenkov detector is sensitive to muons with an energy threshold from around 1.2 to 6.5 GeV for the pressure of filled nitrogen at -0.5 to...
Quantum Monte Carlo simulations of strongly interacting fermionic models face significant challenges due to the sign problem, which complicates efficient configuration sampling. The Meron Cluster algorithm has proven effective in resolving the sign problem for both non-relativistic and relativistic fermions, as well as for fermions coupled with U(1) gauge links in (1+1)D. In this study, we...
We have developed a background model for a High-Purity Germanium (HPGe) detector using Monte Carlo simulations, focusing on accurately representing low-energy interactions within the 0 to 100 keV range. Initial simulations revealed discrepancies between experimental and simulated spectra, with peaks at 63 keV, 77 keV, and 87 keV appearing in simulations but absent in experimental data. To...
We present a custom DAQ system for a test setup that characterizes some unknown scintillator paddles. In this setup, 3 scintillator paddles with known properties are used to characterize a fourth scintillator paddle. Each scintillator is read using an SiPM, where the 3 SiPMs corresponding to the known scintillators are powered from the same bias source, while the SiPM for the scintillator...
Active Galactic Nuclei (AGN) are astrophysical sources powered by the accretion of material onto supermassive black holes at the centers of galaxies, emitting energy across the entire electromagnetic spectrum. AGNs often exhibit significant variability at different wavelengths, spanning timescales from minutes to years. Micro-variability can occur on minute scales, intra-day variability over...
The effects of physics beyond the Standard Model may be parametrized by a set of higher-dimensional operators leading to an effective theory. The introduction of these operators makes the theory nonrenormalizable, and one may reasonably expect a violation of unitarity in 2 → 2 scattering processes, depending on the values of the Wilson coefficients of the higher dimensional operators. Bounds...
Galactic cosmic rays (GCRs) are deflected by the Sun’s magnetic field, resulting in significant energy-dependent temporal and spatial variations in their intensity. The muons observed at GRAPES-3 arise from extensive air showers of cosmic ray secondaries originating in the interactions of primary cosmic rays with the upper atmospheric particles. We observed strong correlations between the muon...
The measurements in high-multiplicity proton-proton (pp)
collisions show several features that are similar to those observed in heavy-ion collisions. In
this
respect, strangeness
production may
provide a valuable investigative tool.
Baryon-to-meson ratios have been measured differentially in $p_T$ and show an evolution with
increasing charged particle multiplicity in small systems...
The classical conservation of the lepton number is an accidental symmetry present in the Standard Model (SM). Thus, we consider here a scenario where the SM is extended with a U(1) gauge group, promoting the lepton number to a local symmetry. The gauge anomaly cancellations necessitate the extension of the particle spectrum with several beyond the SM (BSM) particle fields. The extended lepton...
Strangeness enhancement has long been considered as a signature of the quark-gluon plasma formation in heavy-ion collisions. Strangeness enhancement has also been observed in small systems at the LHC, but the underlying physics is not yet fully understood. This motivates studies of strange hadron production in small systems at RHIC, where the energy density of the created system is expected...
Primary cosmic rays (PCRs), on entering the Earth’s atmosphere, interact and create particle showers known as extensive air showers (EAS). EAS produced by heavier mass PCRs are observed to contain more muons than those created by lighter PCRs. As a result, muon multiplicities in EAS have often been used as an indicator for estimating the PCR composition. Thus, an accurate determination of the...
The event-by-event fluctuations in particle yields in heavy-ion collisions are sensitive to the quark-gluon plasma (QGP) susceptibilities. The measurement of such fluctuations is of interest as they may show critical behavior in the proximity of phase boundary of hadron gas-QGP phase diagram. The $\nu_{\mathrm{dyn}}$ correlator is generally used to study the magnitude of fluctuations of the...
Amid uncertainty about the fundamental nature of neutrinos, we adopt the Dirac framework and construct a model based on the $\Delta(27)$ symmetry. The model successfully explains the hierarchical structures of both charged lepton and neutrino masses. The resulting neutrino mass matrix features four texture zeros, and the corresponding mixing scheme, governed by a single parameter, aligns well...
Neutrino flavor evolution inside a core collapse supernova is a topic of active research at present. The core of a supernova is an intense source of neutrinos and antineutrinos. The self-interaction among the neutrinos (as well as antineutrinos) gives rise to a rich phenomenology which is not seen in terrestrial situations. In studies of dynamics of flavor evolution in such environments, the...
In this work, we study a hybrid scoto-seesaw mechanism based on modular $A_4$ symmetry, which has many interesting phenomenological implications. In this scoto-seesaw framework, the type-I seesaw mechanism generates the atmospheric mass square difference ($\Delta m^2_{\rm{atm}}$) at the tree level. Additionally, the scotogenic contribution plays a crucial role in obtaining the other mass...
In this work, we investigate the two-zero textures of the light neutrino mass matrix within the framework of a Left-Right Asymmetric model. The model is constructed using the modular group $\Gamma_{3}$, which is isomorphic to the $A_{4}$ discrete group, and the light neutrino masses are generated via an extended seesaw mechanism by introducing an additional sterile fermion. After assigning the...
The phenomenology community has extensively investigated the extreme conditions of matter within fermionic dark matter (FDM) admixed neutron stars using various effective field theories. A popular model in this context is hereby referred to as the σ − ω − ρ + FDM model, which incorporates fermionic dark matter interacting with baryonic matter through new scalar and vector mediators. However,...
The analysis of the $B_c^+ \to B_d \mu^{+} \nu_{\mu}$ transitions in mesonic decays for the search of new physics in the presence of right-handed neutrinos would be an interesting aspect of the phenomenological study. We have followed the effective field theory approach for the low-energy effective Hamiltonian comprising the dimension-six operators. The new physics operators are constrained by...
The charm sector offers considerable scope for exploring new physics (NP) beyond standard model (SM). Rare charm decays which proceed through the flavour changing neutral current (FCNC) transitions are effectively suppressed due to the Glashow-Iliopoulos-Maiani mechanism. This makes charm decays sensitive to NP effects [1]. Several phenomenological studies have been done to look for NP in the...
In this article, we investigate the potential of the angular distribution of the $B \to D^* \ell \nu_\ell$ process to search for new physics signals. The Belle collaboration has analysed it to constraint $V_{cb}$ and the $B\to D^*$ form factors, under the assumption of the Standard Model. With the newly released lattice QCD data, we can perform a simultaneous fit of the form factors, $V_{cb}$...
The proposed talk aims to provide an overview of the research highlights from the CMS experiment at CERN-LHC to explore the exotic physics beyond the Standard Model of particle physics. The recent findings from new physics searches in the exotica sector will be presented using the LHC proton-proton collision dataset collected during the Run 2 and Run 3, corresponding to a center-of-mass energy...
This talk presents the upgrade of silicon-based tracking detectors in the CMS, ATLAS, LHCb, and ALICE experiments for the HL-LHC. The different design choices of the detectors to cope with the challenges posed by the HL-LHC environment are discussed.
Polarized semi-inclusive deep-inelastic scattering (SIDIS) is a key process in the quest for a resolution of the proton spin puzzle. We present the complete results for the polarized SIDIS process
at next-to-next-to-leading order (NNLO) in perturbative quantum chromodynamics. Our analytical results include all partonic channels for the scattering of polarized leptons off hadrons and...
Semi inclusive deep inelastic scattering (SIDIS) process can provide insight into
the internal structure of hadrons and also the dynamics of fragmentation
of parton into hadrons. Often the perturbative predictions contain large
threshold logarithms that need to be resummed to all orders in order
make the predictions stable. In this work, we develop a formalise
that will allow us to...
We investigate the non-radial fundamental f-mode oscillations of dark matter (DM) admixed strange quark stars (DMSQSs) using an equation of state (EoS) that accounts for feebly interacting DM in strange quark stars (SQSs). By varying EoS parameters, we examine the structural properties (mass, radius, and tidal deformability) of DMSQSs in light of astrophysical constraints. Our analysis reveals...
The inflationary era is mostly related to the classical gravity in the Friedmann–Robertson–Walker (FRW) universe. In this study, we explore the behavior of a nonclassical scalar field in the context of the Friedmann-Robertson-Walker (FRW) universe. We represented the massive inflaton field in the semi-classical gravity using a coherent squeezed vacuum state. This state provides insight into...
We investigate the effect of the quantum chromodynamics (QCD) critical point on the isentropic trajectories in the QCD phase diagram. We point out that the universality of the critical equation of state and the third law of thermodynamics require the specific entropy (per baryon) along the coexistence (first-order transition) line to be nonmonotonic at least on one side of that line....
This study addresses the tension observed between the NOνA and T2K long-baseline accelerator experiments in determining the standard CP phase, exhibiting more than 90% confidence level with two degrees of freedom. We explore the potential for new physics beyond the standard model, specifically focusing on non-isotropic Lorentz Invariance Violation (LIV) as a means to resolve this discrepancy....
Jets traverse a longitudinally boosted, flowing quark-gluon plasma (QGP), causing their internal structure to undergo anisotropic modifications due to the superposition of vacuum-like showers and medium-induced gluon emissions. These interactions lead to softer particles drifting with the QGP flow away from the jet core, where high-$p_\mathrm{T}$ particles remain concentrated, resulting in an...
Quantum correlation measures are extensively studied in neutrino systems as some measures show nonclassical features in neutrino oscillation. Entanglement is also a splendid measure to study in neutrino system. Recently it was shown that entanglement of formation (EoF) and concurrence are better entanglement measures than negativity. We analyze the effects of non-standard interaction (NSI) on...
MINERvA stands for Main Injector Neutrino Experiment for $\nu-A$ scattering, located in the NuMI(neutrinos at the Main Injector) beamline sitting 100 m underground on-site at Fermilab in Batavia, Illinois. The detector uses fine-grained plastic scintillator detector. It used 3 GeV(LE) and 6 GeV(ME) neutrino beams from the NuMI beam facility, on different nuclear targets(C, Fe, Pb and water)...
The decay $B^0 \rightarrow \omega \gamma$ provides a unique probe into flavor-changing neutral current processes, where the $b$-quark transitions to a $d$-quark via a one-loop radiative process. This rare channel, sensitive to potential new physics contributions, enables the search for virtual particles that could influence the branching fractions and polarization observables. Standard Model...
It was originally thought that small collision systems such as electron-positron, electron-proton, and proton-proton(pp) collisions would produce final states that were too small and dilute for secondary partonic rescatterings to drive the system toward thermal equilibrium. Collective hydrodynamic behavior was not expected to play an important role in these final states, notwithstanding some...
Gas Electron Multiplier (GEM) is a cutting edge detector technology that belongs to the group of Micro Pattern Gaseous detectors (MPGD). One of the key factors in selecting detectors for High Energy Physics (HEP) experiments is its long-term stable operation. One effective way to benchmark the stability of the chambers is to examine how well they perform under prolonged irradiation. A study...
Cosmic Strings are hypothetical energy densities arising from topological defects in the early universe. Despite various theoretical studies over the years, there has yet to be significant evidence of its existence. Cosmic Strings produce gravitational waves and cause gravitational lensing making these two methodologies the most studied upon. Theories have also suggested the decay of cosmic...
The octant of $\theta_{23}$ is one of the unknown parameters of the standard three flavor neutrino oscillation framework. In this work, we explore the octant sensitivity in the presence of a light sterile neutrino corresponding to mass-squared difference [$10^{-4}:10^{-2}$]eV$^2$ along with the degenerate solutions in the test $\theta_{23}-\delta_{CP}$ planes. Our analysis has been performed...
We investigate pulsating strings in the background of a single stack of NS5-branes as well as in an I-brane configuration, which consists of two orthogonal stacks of NS5-branes, employing the Polyakov formulation of the fundamental string action. For the I-brane setup, we utilize a symmetry that effectively decouples the dynamics of the two spheres from the flat space components. This allows...
We propose a class of models based on the parity invariant Left-Right Symmetric Model (LRSM) which incorporates the mechanism of radiative generation of fermion masses while simultaneously possessing the solution to the Strong CP problem. A flavour non-universal gauged abelian symmetry is imposed on top of LRSM, which helps in inducing the masses of second and first-generation fermions at...
One-Loop Leptogenesis: Unraveling Extra CP Phases Incorporating Dark Sectors
Despite the success of the Standard Model (SM), the observed baryon asymmetry (BA) of the Universe remains an unresolved issue, motivating exploration beyond the Standard Model (BSM). The leptogenesis mechanism provides a plausible explanation, proposing that an asymmetry generated in the lepton sector is...
Background: Phase shift analysis of nucleon-nucleon elastic scattering has been conducted up to 350 MeV by various research groups, employing realistic interaction potentials based on pion and meson exchange.
Purpose: Objective of this research is to develop inverse potentials for both real and imaginary scattering phase shifts by utilizing the optical potential for proton-proton...
Resistive Plate Chambers (RPCs) are essential in particle physics for their high performance and cost-effectiveness. However, maintaining a consistent and uniform gas flow is crucial for optimizing RPC efficiency and preventing contamination, which can compromise detector integrity. This study investigates gas flow dynamics within RPCs using COMSOL Multiphysics simulations, focusing on...
Muon tomography is a imaging technique that reconstructs an object's internal structure by examining cosmic ray muon trajectories as they contact with various materials. This study focuses on the design and simulation of a Geant4-based scintillator strip detector for muon tomography. The detector is made up of 15 mm-wide scintillator strips that are optimized for spatial resolution and exact...
The CMS experiment is preparing for the High Luminosity phase of the Large Hadron Collider (HL-LHC), set to begin in the late 2020s. To cope with the significantly harsher operational conditions expected during this phase, including an unprecedented increase in instantaneous luminosity and particle fluence, the CMS collaboration has planned a comprehensive upgrade of its tracking system. The...
This study examines parameter space sampling for Beyond the Standard Model (BSM) physics, a computationally intensive task in High Energy Physics (HEP). Simulation-Based Inference (SBI) offers a promising alternative to traditional likelihood-based methods by circumventing the need for explicit likelihood calculations, which are often intractable for BSM scenarios. We apply SBI...
The coupling of fermions with gravity can be non-universal, leading to a current-current four-fermion interaction beyond the Standard Model that also generically has different couplings for different chiralities of fermions. Such an interaction is found to break discrete symmetries like parity and charge conjugation. We calculate the contribution of this interaction to parity-violating...
The Electron Ion Collider (EIC) is an approved project in the USA, to be built at Brookhaven National Laboratory (BNL) with a joint effort from Jefferson Lab (JLab). In the EIC, the contribution of the quarks and gluons to the macroscopic properties of nucleon and nuclei will be studied in an unexplored kinematic phase space. The key physics questions, viz. emergence of the hadronic mass, the...
The effective action, finding which to the leading order involves computation of one-loop determinants, happens to be the primary ingredient for studying the phases of a quantum field theory. In this talk, which is based on our papers [1] and [2], I will describe a method for computing one-loop partition functions for fermions and U(1) vectors on AdS$_{d+1}$ space for zero and finite...
Positioned at the innermost regions of the CMS detector, the silicon tracking system aims to measure charged particle trajectories with high precision. The tracking system is instrumented with both silicon pixel and strip detectors. The strip detector has been operational since the start of LHC Run 1 operations, whereas a new pixel detector was installed in 2017. The innermost layer of the...
The CMS Collaboration is preparing to upgrade its current endcap calorimeters for the HL-LHC era by implementing a high-granularity calorimeter (HGCAL). This new design will feature unprecedented transverse and longitudinal segmentation in both the electromagnetic and hadronic compartments, enabling 5D information (space, time, energy) readout. Silicon sensors are utilized for the...
The High-Luminosity phase of the Large Hadron Collider at CERN, will pose new challenges for the detectors. The Barrel Electromagnetic Calorimeter (ECAL) of the CMS experiment will be equipped with a completely new readout electronics to cope with increase in the number of proton-proton collisions per bunch crossing, as high as 200, and higher noise induced by large radiation doses.
Beams...
Single-gap RPC is among the family of gaseous detectors used in high-energy physics experiments. They are known for their fast response time, high efficiency and low fabrication cost per unit area. RPCs are typically constructed using glass or bakelite plates with high bulk resistivity in the range of approximately 10^9 - 10^12 Ω cm. In the present work, bakelite RPC prototype is built with a...
The region of QCD phase diagram characterized with low temperature and high baryonic density is been speculated to be found in the cores of neutron stars which are prone to phase transitions. In my present work, the transition between the chiral and diquark condensate is being studied while reproducing some numerical results. The thermodynamic grand potential of system is minimized with...
A phase transition in the early Universe, at a critical temperature $T_*$, induces a temperature dependent mass for right handed neutrinos (RHNs) that eventually stabilizes to a constant value through the Higgs vacuum expectation value ($vev$) after electroweak symmetry breaking (EWSB). This dynamical variation in the mass of RHNs with temperature enables us to achieve RHN mass below the...
We propose a Dirac mass model within the framework of Type-I seesaw, utilizing $A_4$ modular symmetry. Modular symmetry is crucial, as the Yukawa couplings are structured as modular forms, specifically in terms of the Dedekind eta function $\eta(\tau)$. This symmetry ensures that the Yukawa couplings transform similarly to the other matter fields, eliminating the need for extra flavon fields....
The photon emission from a finite Baryonic Quark-Gluon Plasma is evaluated through the Annihilation and Compton processes using the Boltzmann distribution function. The evaluation is done with the consideration of a finite baryonic parameter in the quark mass and the coupling constant. By the consideration of this parameter in the system the production rate of photon is enhanced from the...
The European Spallation Source (ESS), currently under construction in Sweden, will generate an intense pulsed neutrino flux, enabling high-statistics measurements of Coherent Elastic Neutrino-Nucleus Scattering (CE$\nu$NS) with advanced detection systems. The exceptional precision and large statistics anticipated from ESS-CE$\nu$NS measurements present a unique opportunity to explore physics...
We have investigated the pseudo-scalar meson structure in the form of transverse momentum-dependent parton distribution functions (TMDs) and generalized parton distribution (GPDs) in the light-front based quark model. Starting from leading order, we have calculated all the time-reversal even TMDs for pion and kaon up to twist-4. The parton distribution functions (PDFs) of pseudo-scalar mesons...
Effective field theories (EFTs) can encapsulate quite successfully the physics of QCD; in presence of a realizable separation of scales. At very low and high temperatures respectively; theory of pions, and an effective weak coupling expansion describe the physics successfully. Because of the dependence on hierarchy of scales, these EFTs usually become unsuitable around cross over temperature....
Axions, hypothetical particles proposed to resolve several fundamental issues in cosmology and particle physics, in the presence of magnetic fields [1-3], leading to significant implications for astrophysical observations [4-6]. In this study we investigate the interaction of pseudoscalar axion with photons in a magnetized medium background medium.
We focus on a compact star...
In this study, we have theoretically evaluated the polarized nucleon structure functions $g_{1N,2N}(x,Q^2)$, via longitudinally
polarized charged lepton induced deep inelastic scattering (DIS) off longitudinally polarized nucleon target~\cite{Zaidi:2024obq},
using DSSV14 parameterization~\cite{DeFlorian:2019xxt} for the polarized parton density distribution functions (PPDFs) in the 3-flavor...
We calculated the Polyakov loop potential with chemical potential. The potential is calculated for a matter of both quark and hadrons and the quark matter at rich baryonic matter. It is identified from the calculation that there is a stability in the Polyakov potential with the chemical potential for different fields. From the quark and hadronic matter but the quark matter there is no such...
We present precise measurements of the mass and decay width of the top quark in the t-channel, the dominant production mode for single top quarks at the LHC. The final state includes a top quark and a light quark, resulting in at least two jets, one of which originates from the hadronization of a b-quark, along with an isolated high-momentum lepton (electron or muon) and significant missing...
Despite compelling evidence from numerous astrophysical and cosmological observations, dark matter (DM) remains an enigma, lacking much insight into its fundamental properties and evolution in the early universe.
In this talk, we discuss how different DM scenarios, constructed with a minimalistic setup, can be probed at the collider, especially in the context of the Large Hadron Collider...
Higher-order cumulants of (net-)proton multiplicity distributions are sensitive observables for studying the QCD phase structure. At low baryon chemical potential ($\mu_B$), lattice QCD calculations establish the quark-hadron transition to be a crossover, while at large $\mu_B$, QCD-based models predict a first-order phase transition that ends at a critical point.
Here, we focus on the...
Cosmological observations indicate that the Universe underwent an inflationary
phase in the very early stages of evolution, which lead to its supercooled state.
Then, to again heat up the Universe and generate particles, there was a phase
of preheating and/or reheating, the exact description of which depends on the
particle physics model and the interaction Lagrangian. In contrast to...
The extension of the Standard Model (SM) by a $U(1)_{L_{\mu}-L_{\tau}}$ gauge group is well studied in the literature to address the discrepancy in the muon anomalous magnetic moment. In this study we consider the $U(1)_{L_{\mu}-L_{\tau}}$ gauge group is five dimensional where multiple associated massive gauge bosons appear and these bosons contribute to the muon $(g-2)$ with other processes....
In ultraperipheral collisions (UPCs) involving relativistic heavy ions, the production of heavy-flavor coherent vector mesons through photon-nuclear interactions is a key focus due to its direct sensitivity to the nuclear gluon density. Experimental measurements, however, face a two-way ambiguity as each of the symmetric UPC nuclei can act as both a photon-emitter projectile and a target. This...
In this work[1], we examine the constraints coming from the leptonic sector on the parameter space of the alternative left-right model. These left-right scenarios emerge from the breaking of a grand unified theory based on the $E_6$ symmetry group and introduces new exotic quarks and light bosons in its particle spectrum. For the current exploration, we focused on both flavour-conserving...
The search for new physics beyond the Standard Model (BSM) continues to be a central pursuit in contemporary particle physics, driving the exploration of new particles and interactions. In this talk, we present the results from a comprehensive search for BSM particles in ‘high-mass diphoton events’, a distinctive signature predicted by several SM extensions, including Supersymmetry, extra...
Chiral anomalies in Quantum Chromodynamics (QCD) can lead to phenomena such as the Chiral Magnetic Wave (CMW), which is a collective excitation of chiral charges in the presence of a magnetic field. Investigating this effect could provide valuable insights into the interaction between magnetic fields and chiral anomalies during heavy-ion collisions. The CMW is expected to induce...
New physics scenarios can be probed via neutrino oscillation experiments as it provide direct evidence of physics beyond the Standard Model. Neutrino oscillations which is the transition between different $\nu$--flavors during long-distance propagation can serve as a tool for probing new physics scenarios. One of the possibilities is the interaction of neutrinos with matter fermions via a...
Information about the interior of Earth is traditionally obtained through indirect probes such as seismic and gravitational measurements. Atmospheric neutrinos serve as an independent tool for probing the deep interiors of Earth using weak interactions, offering insights complementary to those obtained from other studies. As multi-GeV neutrinos pass through Earth, they experience Earth matter...
In this paper, a collider signature of a heavy Higgs boson at $14$ TeV HL-LHC is studied, where the heavy Higgs boson decays into a pair of standard model (SM) Higgs boson, which further decays to $bbZZ$ state and subsequently to $bbℓ^+ℓ^−ν_ℓν_ℓ$ final state. To study this, we consider singlet scalar extension of the SM and select the parameter space and mass of the heavy Higgs boson such that...
Hadronic resonances serve as valuable probes for investigating the late-stage evolution of the system formed in ultra-relativistic heavy-ion collisions. Since the lifespans of resonances are comparable to the lifetime of the hadronic phase, they are affected by the competing re-scattering and regeneration mechanisms, which may alter their momentum distributions and can result in the...
We show that observations of primordial gravitational waves of inflationary origin can shed light into the scale of flavor violation in a flavon model which also explains the mass hierarchy of fermions. The energy density stored in oscillations of the flavon field around the minimum of its potential redshifts as matter and is expected to dominate over radiation in the early universe. At the...
This research introduces an innovative machine learning (ML)-assisted nested sampling approach aimed at exploring Beyond the Standard Model(BSM) parameter spaces more efficiently. Traditional methods like Markov Chain Monte Carlo (MCMC) and Hamiltonian Monte Carlo (HMC) often face limitations in high-dimensional, multi-modal spaces,leading to computational bottlenecks. Our method combines...
In the standard interaction framework, neutrino oscillations are sensitive only to mass-squared differences, making it challenging to directly measure absolute neutrino masses via neutrino oscillation experiments. However, scalar non-standard interactions (SNSI) can introduce sub-dominant terms in the neutrino oscillation Hamiltonian that directly influence the neutrino mass matrix, offering a...
In the Standard Model (SM), flavour-changing neutral-current (FCNC) decays in the charm sector are highly suppressed since they do not occur at the tree level due to the Glashow-Iliopoulos-Maiani (GIM) mechanism. So we can perform several phenomenological studies in these decays to look for new physics (NP). Here, we shall analyse the rare charm baryon decay $\Lambda_c→p\mu^+ \mu^-$ in the...
Recent observations on the high-multiplicity proton-proton ($p-p$) collisions, similar to the phenomenon observed in heavy-ion collisions, provide a glimpse into the possible formation of the strongly interacting quark-gluon plasma (QGP) in such small systems. Unlike nucleus-nucleus (A$-$A) collisions, the transverse and longitudinal dimensions in $p-p$ collisions are comparable, leading to...
The small production cross-section of higgsinos poses a persistent challenge for detection at the LHC. We focus on a simplified R-parity violating supersymmetric model, where existing ATLAS limits on higgsino mass are around 450 GeV—significantly weaker than those for wino and bino counterparts. In this study, we investigate the potential to probe higgsino masses in the range of 400 to 1000...
New heavy gauge bosons appear in many BSM extensions. For a new SU(2) symmetry, the corresponding charged vector boson $W^\prime$ can be either left handed or right handed. Therefore, it is crucial to devise some observables that can distinguish the pure left handed versus pure right handed case provided the heavy $W^\prime$ discovered at the LHC in order to pinpoint the underlying gauge...
The measurement of strangeness production is an important tool for understanding the hot, dense matter created in relativistic heavy-ion collisions. The strange hadron production is enhanced in heavy-ion collisions due to thermal gluon saturation, while it is suppressed in smaller systems as predicted by canonical models. Although strangeness enhancement is among the earliest proposed...
The study aims to precisely measure the $\pi^+\pi^-$ and $\pi^+\pi^-\pi^0$ cross sections from $e^+e^-$ collision data at Belle II. These measurements are intended to improve the theoretical predictions of the muon’s anomalous magnetic moment, currently showing a 5.1-sigma deviation from Standard Model expectations—a hint of possible new physics. Using high-luminosity data at Belle II, we...
The effect of noise induced by gravitons has been investigated using a Bose-Einstein condensate. The general complex scalar field theory with a quadratic self-interaction term has been considered in the presence of a gravitational wave. We then vary the action and make use of the principle of least action, and obtain two equations of motion corresponding to the gravitational perturbation and...
The interaction of heavy quarks with the quark-gluon plasma (QGP) significantly influences their azimuthal distribution and transverse momentum ($p_{\mathrm{T}}$) spectra. Consequently, azimuthal anisotropy coefficients ($v_n$) and nuclear modification factors ($R_{AA}$) of heavy flavor hadrons serve as essential observables for probing QGP properties. This talk presents the first measurements...
We investigate the phenomenology of the electroweak gauge bosons $W^{+}$, $W^{-}$, $Z^{0}$, and the Higgs boson as composite states of new fermions governed by strong dynamics. To produce these composite particles, we propose a model in which production occurs through the Drell-Yan process, $q \ \bar{q} \rightarrow q_{TC} \ \bar{q}_{TC}$, where $q_{TC}$ denotes a technicolor quark forming a...
The measurements of heavy-flavour (charm and beauty) production in proton-proton (pp) collisions at the LHC provides stringent test for perturbative Quantum Chromodynamics (pQCD) calculations. Furthermore, studies in pp collisions serve as a necessary baseline for the same measurement in proton-nucleus (p-A) and nucleus-nucleus (A-A) collisions in order to investigate the influence of cold-...
The studies of heavy flavor (charm or bottom) hadrons in relativistic collisions provide an undisputed testing ground for the theory of strong interactions, quantum chromodynamics (QCD). As the majority of the heavy flavor particles are produced in the initial stages of the heavy-ion collisions, they experience the whole QCD medium evolution. The lightest open charm meson, $D^{0}$, and hidden...
The emergence of jets, bunches of collimated hadrons, in high-energy colliders is a prevalent phenomenon. In the current LHC context, along with traditional narrow QCD jets, the study of fat jets, which may appear as a result of the decay of a heavy particle, has become an essential part of collider studies. Current jet clustering algorithms, namely kt-type sequential recombination...
This analysis describes prospects of the sensitivity of the strong coupling constant 𝛂s at the FCC-ee using studies based on 3-jet/2-jet cross-section ratio (R3/2) and the Lund Jet Plane (LJP) representation. Preliminary results demonstrate the dependence of R3/2 on 𝛂s, providing key insights into the re-interpretation of these measurements through QCD studies. For LJP studies, preliminary...
Experimentalists worldwide are dedicating tremendous efforts to the design of cryostats aimed at minimizing the dominant radiation-induced heat load on the cryogenic liquid housed within. These advancements are crucial for maintaining the safe, stable, and reliable operation of detectors, particularly in large-scale experiments aimed at investigating rare physics phenomena with increasing...
In scenarios like QGP being a vortical fluid, the partons are supposed to be polarized, and, as a result, hadrons produced at the chemical freezeout boundary are also thought to be polarized. Such a non-zero polarization of $\Lambda (\bar{\Lambda})$ hyperons has been observed in heavy-ion collisions at ALICE and STAR Collaborations. Recent studies suggest the transverse component of the...
Abstract: The CMS experiment at CERN is foreseen to receive a substantial upgrade during Long Shutdown-3 (LS3) to handle the large number of pileup events in the High-Luminosity LHC. The objective is to increase the integrated luminosity by a factor of 10 beyond the LHC’s design value. The CMS just commissioned the Gaseous Electron Multiplier (GEM) detector, namely GE1/1, at the endcap...
Strong phase parameters measured for $D^0 \rightarrow f$ meson are performed studying quantum correlated $\psi(3770) \rightarrow D^0 \bar{D}^0$ decay by BESIII collaboration for $f$ final states. These parameters serve as an important input to constrain $D^0-\bar{D}^0$ meson mixing parameters and constraining the direct measurement of unitary triangle angle $\gamma/\phi_{\rm 3}$ from $B$...
Generalized transverse momentum dependent parton distributions (GTMDs) capture most of the information about quarks and gluons in both position and momentum space. The Fourier transform of GTMDs yields the Wigner distribution, which provides parton densities in momentum space, position space, or a combination of both. Most previous studies related to GTMDs and Wigner distribution have assumed...
Quarkonium production in ultra-relativistic collisions is an essential probe for understanding the deconfined phase of QCD matter. Further, quarkonium suppression in heavy-ion collisions supports the existence of the deconfined, thermalized, and strongly interacting QCD medium known as quark-gluon plasma (QGP). However, phenomena like collective flow, which is assumed to be another crucial...
We explore the dynamics of the massless scalar field in the context of hairy black holes within the Einstein-Maxwell-scalar gravity system. Utilizing both the series solution and shooting methods, we numerically compute the corresponding quasinormal modes (QNMs) across various black hole parameters. Notably, the values obtained from these two methods exhibit robust agreement. The consistently...
We study the covariant phase space for Einstein- Gauss- Bonnet gravity, admitting weak isolated horizons as inner boundary. We find out that the Hamiltonian charge corresponding to residual Lorentz boosts on the horizon matches exactly with the Wald entropy. We also give a derivation for quasilocal first law of black hole mechanics in Einstein-Gauss- Bonnet gravity.
MALTA2, the second generation of the MALTA family Depleted Monolithic Active Pixel Sensor, is a small collection electrode prototype fully fabricated using Tower's 180nm CMOS Imaging Sensor process. Various improvements have been implemented in MALTA2 higher doping concentration of the n$-$ blanket layer or the manufacturing on Czochlraskli substrates. Extensive radiation hardness studies...
We present a comprehensive analysis of tensor (current) form factors for $B_c$ to vector ($V$) meson transitions within the framework of the self-consistent covariant light-front quark model (CLFQM). Utilizing CLFQM, we calculate tensor form factors and predict radiative weak decays of $B_c$ mesons involving vector mesons. We also investigate the interplay of short-distance and...
In this work we have investigated the $\ h_c(1\mathcal{P}))$ $\rightarrow$ $\eta_c(1\mathcal{S}) + \gamma$ decay in Light Front Quark Model (LFQM) .The transition from factor(TFF) and decay width for this decay has been calculated and compaired with experimental result along with other model predictions. This kind of decay gives a visual representation of radially excited states of...
The GRAPES-3 experiment located at an altitude of 2200 m in Ooty, India, employs a dense array of plastic scintillator detectors complemented with a large-area tracking muon detector. It is designed to observe shower particles which mostly include gamma rays, electrons and muons produced by interactions of primary cosmic rays and gamma rays in Earth’s atmosphere in TeV-PeV energies. Recently,...
Understanding the internal structure of the nucleons and the fundamental interactions that govern the particle behavior such as mass, spin, and distribution of momentum among quarks and gluons is crucial to reveal a clearer picture of the Standard Model of Particle Physics. To probe these, an Electron-Ion Collider (EIC) experiment will be built, which will unlock the secrets of the strong...
The Compressed Baryonic Matter (CBM) experiment, being developed at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, is focused on exploring the phase diagram of strongly interacting matter at high net baryon densities and moderate temperatures. The, SIS-100 accelerator ring at FAIR accelerator facility will deliver accelerated beam with kinetic energies reaching 29...
Utilizing Zubarev's nonequilibrium statistical operator, we derive the second-order expression for the dissipative tensors in relativistic spin hydrodynamics, namely the rotational stress tensor ($\tau_{\mu\nu}$), boost heat vector ($q_\mu$), shear stress tensor ($\pi_{\mu\nu}$), and bulk viscous pressure ($\Pi$). The emergence of the first two terms, $\tau_{\mu\nu}$ and $q_\mu$, is attributed...
Muon radiography is an imaging technique based on the absorption of atmospheric muons. At NISER, we are building a muon telescope for muon radiography applications. The telescope is in modular form comprising four planes. Each plane is made of an acrylic chamber housing a Resistive Plate Chamber (RPC) as tracking element and PCB based readout boards to provide X and Y position of the muon hit....
In this work, we consider a resonant bar detector of gravitational waves in the generalized uncertainty principle (GUP) framework with linear and quadratic momentum uncertainties. The phonon modes in these detectors vibrate due to the interaction with the incoming gravitational wave. In this uncertainty principle framework, we calculate the resonant frequencies and transition rates induced by...
In this study, we perform a comprehensive analysis of the perturbed TBM scenario for deriving the numerical constraints on Leptonic CP phases from the parameter space, allowed by the neutrino mixing angle data. We investigate the corrections of the types $U_{ij}^{l}\cdot U_{TBM}\cdot U_{kl}^r$, $U_{ij}^{l}\cdot U_{kl}^r \cdot U_{TBM}$, and $U_{TBM} \cdot U_{ij}^{l}\cdot U_{kl}^r$ for normal...
In this talk, we will use the affine connections to introduce new fields that can be helpful to explain a few cosmological observations.
We have previously introduced two massless scalar fields using connections more general than the
Levi-Civita connections in the Einstein-Palatini action. These fields contribute positive and negative stress tensors to Einstein's equation and can be useful...
We perform a comprehensive analysis of neutrinoless double beta decay and its interplay with low-energy flavor observables in a radiative neutrino mass model with scalar leptoquarks $S_1(\bar{3},1,1/3)$ and $\widetilde{R}_2(3,2,1/6)$. We carve out the parameter region consistent with constraints from neutrino mass and mixing, collider searches, as well as measurements of several flavor...
We study Gravitational Waves (GWs) in modified gravity theory. We choose metric $f(R)$ gravity to explore the characteristics of GWs in the presence of an additional scalar field. We examine additional polarization modes (longitudinal and breathing modes) beyond standard ''plus" and ''cross" modes of polarization, predicted by general theory of relativity. The study also focuses on the nature...
Neutrino mass and mixing cannot be explained with the Standard Model which leads to the exploration of frameworks beyond the Standard Model (BSM). The possibility of neutrinos interacting with fermions via a scalar mediator is one of the interesting prospects. These new interactions can modify the neutrino oscillation probabilities leading to observable effects in experiments. The effects of...
Properties of multiplicity fluctuations in charged particles produced in Xe--Xe collisions at $\sqrt{s_{\rm NN}}$ = 5.44 TeV were studied using normalized factorial moments $F_{\rm q}$ in the framework of intermittency. A fundamental characteristic of the critical behaviour of a system undergoing phase transition is that it exhibits fluctuations of all scales. Study of fluctuations is thus one...
Charge lepton flavor violation in the tau sector, an
unambiguous signature of New Physics, has been searched in many
channels by multiple collaborations, including BaBar, Belle, Belle II,
LHCb, ATLAS and CMS. Current experimental status and future
improvements are discussed. Combined upper limits as compiled by the
Tau subgroup of the Heavy Flavor Averaging group are presented,...
The GRAPES-3 experiment, situated in Ooty, Tamil Nadu (11.4°N, 76.7°E, 2200 m a.s.l.), is an array of 400 plastic scintillator detectors arranged in a hexagonal grid spanning 25,000 m², complemented by a muon detector made of proportional counters covering 560 m². The latter enables extensive air showers originating in gamma rays from Galactic and extragalactic sources within the TeV–PeV...
A search is presented of SM Higgs boson decaying to 2 light pseudo-scalars “a” each of which decays to a bottom anti-bottom (bb ̅) pair. The search is performed in the pseudo-scalar “a” mass range of 10 – 50 GeV and uses data collected by the CMS experiment at center-of-mass energy (√s ) equals to 13 TeV corresponding to an integrated luminosity of 59.83fb^(-1) in 2018. The large mass of Higgs...
Significant progress was made with LHC Run-2 data in probing the Higgs boson (H) self-interaction via searches for HH pair production. The strength of the H self-interaction is unmeasured so far, and its value has implications ranging for the long-term stability of the universe to the presence of new physics. With the large datasets now being collected at the LHC, we have entered a new era in...
A search for a high mass scalar decays to a pair of Z bosons (H → ZZ) is performed using proton-proton collision data from the Run2 dataset of CMS experiment at the Large Hadron Collider, CERN. The ZZ final state provides a clean and sensitive probe for both Standard Model Higgs processes and potential new physics phenomena, such as heavy resonances decaying to Z boson pairs. Advanced...
The Standard Model (SM) of particle physics is the most successful theory in describing fundamental particles and their interactions. It characterizes ordinary hadronic matter as consisting of quark-antiquark pairs or three-quark combinations, forming mesons and baryons. Beyond this, the SM also allows the existence of exotic hadrons composed of more than three quarks or a bound state of...
Measurements at the LHC have provided evidence for collective behavior in high-multiplicity proton-lead (pPb) collisions through multiparticle correlation techniques. Yet, no conclusive evidence of jet quenching, indicating the energy loss of high-$p_\mathrm{T}$ partons as they traverse the medium, has been detected in pPb. This raises the intriguing question: How can a medium described by...
We present a search for the yet-unobserved $B \rightarrow D^{(*)}\eta\pi$ decay at Belle and Belle II. This search aims to provide insights into the semi-leptonic (SL) gap, which refers to the deficit in the sum of the branching fractions of known exclusive decays compared to the measured inclusive $b \rightarrow c\ell\nu$ branching fraction. Common models addressing this deficit suggest the...
Results from search for the rare decays of the standard model\,(SM) Higgs and Z boson to a J/$\Psi$ or $\Psi'$ meson and a photon, with subsequent decay of the meson to a pair of muons will be presented in this contribution. The analysis is performed using data recorded by the CMS detector during full Run 2 from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an...
A decade after the discovery of the Higgs boson by the ATLAS and CMS experiments at the LHC, along with the subsequent observation of ttH events and studies of Higgs decays into pairs of W/Z bosons and $\tau$ leptons, the search for physics beyond the Standard Model (BSM) continues to present significant challenges. Vector-like quarks (VLQs) are hypothetical spin-1/2 particles of a fourth...
After the Higgs boson discovery in 2012, the experiments at the LHC are continuing to study this particle and look for physics beyond the standard model. Some of the Higgs boson properties, such as the mass, has been measured with sub-percent level accuracy. Yet the present integrated luminosity is still a limiting factor for measuring the Higgs boson self- coupling or the first generation...
The minimal supersymmetric standard model (MSSM) with $R$-parity conservation identifies the lightest neutralino ($\tilde{\chi}_1^0$) as a viable dark matter (DM) candidate. We consider a Wino-dominated lightest neutralino serving as a DM candidate, which accommodates "new physics" at a relatively higher scale, typically beyond the reach of the LHC. We compute all the significant radiative...
In this work, we look at a model of sub-GeV dark matter interacting with quarks via a vector current coupling. In the present day, these low-energy interactions are implemented using the chiral Lagrangian framework and result in effective couplings to light mesons. We have calculated the rates of dark matter annihilation into these mesons, and obtained the expected secondary photon and...
Direct photons are considered as one of the most versatile and clean tools to study relativistic nuclear collisions. These include all photons except the ones from hadron decays. The direct photon spectrum produced in relativistic heavy ion collisions is dominated by prompt photons in the larger transverse momenta $(p_{\rm{T}} >3 \ {\rm GeV}$) region. Whereas, the thermal photons from the...
We estimate the accuracy with which the coefficient of the lepton flavor violating dimension six operators can be measured at the proposed $\mu^+\mu^-$ collider.
Cuts-based analysis is performed to compute the signal significance at the center of mass energies of 3 and 10 TeV respectively, with an integral luminosity of 10 ab$^{-1}$. Using the optimal observables method for the kinematic...
We estimate the accuracy with which the coefficient of the lepton flavor violating dimension six operators can be measured at the proposed $\mu^+\mu^-$ collider.
Cuts-based analysis is performed to compute the signal significance at the center of mass energies of 3 and 10 TeV respectively, with an integral luminosity of 10 ab$^{-1}$. Using the optimal observables method for the kinematic...
The current data on several observables in $b \to s \mu^+ \mu^-$ transitions reveal certain discrepancies with Standard Model (SM) predictions. Considering the possibility that these deviations could stem from new physics, we explore the scenario where a non-universal $Z^{\prime}$ boson may be responsible. Additionally, we hypothesize that its couplings with quarks could influence an...
Exploring Beyond the Standard Model (BSM) physics remains a critical frontier in particle physics, with the ProtoDUNE experiment leading efforts to uncover new phenomena. My project, as a summer student at CERN, involved a comprehensive analysis of simulated BSM signals on the CERN neutrino platform (NP04) of ProtoDUNE, focusing on Heavy Neutral Lepton (HNL) signal simulations and trigger...
The CMS Collaboration is preparing to build replacement endcap calorimeters for the High-Luminosity phase of the LHC. The new high-granularity calorimeter (HGCAL), as its name suggests, is a very fine-grained sampling calorimeter. It is made up of 47 layers of absorbers, mostly made of lead and steel, and active elements, namely silicon sensors in the areas with the most radiation and...
Silicon (Si) detectors are commonly used in nuclear and particle physics experiments due to their capability to precisely measure the energy, position, and time of the particles produced during the experiment. There are different types of silicon detectors fabricated (Si pads, Si pixels, Si strips, MAPs type etc.) based on the need of its applications in nuclear, particle and medical physics....
Strongly interacting massive particle (SIMP) has become one of the promising dark matter (DM) candidates due to its capability of addressing the small-scale anomaly, where the final DM abundance is set via the freeze-out of $3\rightarrow 2$ or $4\rightarrow 2$ annihilation process involving solely the dark sector particles. In this work, we explore the freeze-out of SIMP DM during the...
Shockwave generation in Supernova explosions or in Active Galactic Nuclei (AGN) various jet activities or in gamma ray bursts are common phenomena and the shockfront originates from the central galaxy and moving orthogonal to the plane of the galaxy. As time evolves depending on the velocity of the shock, input energy and ambient medium density it retains its shape and forms gigantic bubbles,...
Micro-Pattern Gas Detectors (MPGDs) represent a category of gaseous ionization detectors based on microelectronics and filled with gases. After a high-energy particle interacts with the gas medium, ions and electrons are produced, which are subsequently accelerated in opposite directions due to the applied electric field. Deflected electrons trigger further ionization to create electron-ion...
The INO-ICAL collaboration has developed multiple prototype detectors utilizing Resistive Plate Chambers (RPCs) as sensitive detectors at TIFR, Mumbai, and IICHEP, Madurai. The Cosmic Muon Veto Detector (CMVD) aims to explore the feasibility of constructing a large-scale neutrino experiment at shallow depths. A primary objective of the CMVD is to achieve a veto efficiency exceeding $99.99\%$,...
Measurements of event-by-event mean transverse momentum ($\langle p_{\rm T} \rangle$) fluctuations are reported in terms of the integral correlator $\langle \Delta p_{\rm T} \Delta p_{\rm T}\rangle$ and skewness of the event-wise $\langle p_{\rm T} \rangle$ distribution in pp collisions at $\sqrt{s}=13$ TeV with the Monte Carlo event generators PYTHIA8 and HERWIG7. The final-state charged...
Gas Electron Multiplier (GEM) based detectors are planned to be used in future collider experiments like the High Luminosity Large Hadron Collider (HL-LHC), Electron Ion Collider (EIC) and Apparatus for Meson and Baryon Experimental Research (AMBER) because they have proven effective for tracking particles in recent experiments. In this context, we have conducted a comparative study through...
In this work, we revisit the Fulling-Davies-Unruh effect in the framework of two-level atomic systems, both single and entangled, which remain static within a thermal bath. We analyze the interaction between these atomic systems and a massless scalar field, considering both free space and a cavity environment. By computing atomic transition rates and comparing them with the findings of our...
We study an SU(N) matrix model with a bosonic weight function and a fermionic interaction term at zero chemical potential. This model represents QCD at a single energy level. We compute the phase transition and provide exact results for several physical quantities in the confined phase, such as free energy and winding Wilson loops.
Charged lepton flavor violation (cLFV) processes, potentially important for various Beyond the Standard Model Physics scenarios are analyzed in the Standard Model Effective Field Theory (SMEFT) framework. We consider the most relevant 2 quark-2 lepton $(2q2\ell)$ operators for the leptonic and semi-leptonic LFV B-decay (LFVBD) processes $B_s\to\mu^+e^−, B^+\to
K^+\mu^+e^−, B^0\to...
In recent years, the experimental discovery of charmed mesons has significantly increased. The latest report from the Particle Data Group (PDG) lists 10 observed excited strange-charmed mesons identified by various experimental collaborations. In this study, we conduct a systematic analysis of the $D_s^{\pm}$ meson by utilizing Regge theory, a widely adopted framework for investigating hadron...
Considering the discoveries of pentaquark structures such as P_{\psi s}^\Lambda(4338)^0, P_c(4380), and P_c(4450), we conducted a spectroscopic analysis of hidden-bottom pentaquarks. Using special unitary group representations, we systematically classified these hidden-bottom pentaquarks into two distinct configurations within the SU(3) flavor representation: the octet and the decuplet. In...
The Gauss- Bonnet theory arises as a truncation of the Lovelock action. We use this action to understand the gravitational collapse of spherical shell of matter. The gravitational collapse of spherical symmetrical dust and viscous fluid matter is detailed by taking different density profiles as initial data.
In the present study, we explore the phenomenon of spin alignment of $\phi$ and $K^{*0}$ vector mesons, as recently observed by the ALICE and STAR collaborations. While a range of sources could potentially contribute to this phenomenon, it is hypothesized that the primary influences are the vorticity and electromagnetic fields, which align with the qualitative description of global...
Recently, the topic of non-invertible symmetry has attracted a lot of interest. The symmetry elements in such a case cannot be implemented by transformations that form groups. In this work, we study a local, frustration-free spin chain, where the ground state is found to be doubly degenerate, resembling the ferromagnetic states in the XXX spin chain. The ground states are connected by a...
The nature of dark energy, which constitutes about 68% of the universe’s total energy, remains one of the most profound mysteries in cosmology. Scalar fields with power law potentials are promising candidate for dark energy. For understanding the dynamics of scalar fields we begin with a general form of power law potential V (ɸ) =V0 ɸ n and try to determine critical points and analyze their...
Neutrinos are very special particles that have led over and over to unexpected and vital discoveries, a number of which have been identified with Noble prizes. Neutrinos have been theoretically invented in 1930 by way of Pauli to maintain strength–momentum conservation and their first experimental detection in 1956 via a crew lead by way of Reines and Cowan on the Savannah River reactor was...
In the current work, we have extended Left-Right Symmetric Model (LRSM) with a sterile fermion per generation, the lightest of which acts as a suitable dark matter candidate for the present model under consideration. Incorporating the sterile fermion, we realise LRSM with the help of modular group of level 3 that is, $\Gamma(3)$ and weight 2. Then, we calculate the dark matter relic density...
We study an approach to simulating the stochastic relativistic advection-diffusion equation based on the Metropolis algorithm. We show that the dissipative dynamics of the boosted fluctuating fluid can be simulated by making random transfers of charge between fluid cells, interspersed with ideal hydrodynamic time steps. The random charge transfers are accepted or rejected in a Metropolis step...
The hypercentral Constituent Quark Model (hCQM) has been employed to obtain the resonance masses of light, strange baryons starting from N to $\Omega$ [1]. The model has linear potential with higher order correction terms with spin-orbit term to best possible predict the spectra of excited states. With these, the strong decays play a significant role towards the understanding of underlying...
The NOvA experiment, primarily designed to study neutrino oscillations, has also proven to be a valuable tool for investigating various astrophysical phenomena. With its near detector situated 100 meters underground at Fermilab and its far detector, spanning 4,000 m² at Ash River, NOvA offers unique capabilities for probing astrophysical properties. This talk presents an overview of recent...
Cosmic muons are capable of producing Cherenkov radiation, a form of electromagnetic radiation that
is produced when a charged particle travels superluminal through a transparent dielectric medium. A
Cherenkov detector which ignores the directionality of the radiation and solely integrates all particles moving
above a set threshold velocity is known as a threshold Cherenkov detector. Since,...
This study investigates the cross-talk effects in the CMS High Granularity Calorimeter (HGCAL) using test-beam data and its comparison with GEANT4 simulation. The Study uses pion beam data on a two-module readout system with no absorbers. Cross-talk effects are studied using two different methods. Various noise mitigation methods have been applied. HGCROC chip-level charge injection is also...
Event shape observables are essential tools for probing Quantum Chromodynamics (QCD) and deepening our understanding of its dynamics. In this contribution, we present a study of charged-particle event-shape observables, specifically transverse thrust and transverse sphericity, measured in inclusive Z boson events where the Z decays into electrons or muons. Given that the Z boson is an object...
Heavy quarks (charm and beauty) have masses much larger than the QCD scale parameter. Due to this they are typically produced in hard scattering processes with large Q^2 in hadronic collisions, and offer a unique perspective to study the transition from quark to hadrons in these collision systems. Recent production measurements of heavy-flavour baryons and mesons in proton-proton collisions at...
The study of higher-order cumulants of conserved quantities—such as net-charge, net-baryon, and net-strangeness distributions—is a valuable approach for determining freeze-out parameters and exploring phase transitions in heavy-ion collisions at LHC energies. Recent studies hint at the formation of Quark-Gluon Plasma (QGP) in smaller systems, such as proton-proton (pp) collisions, which...
The dominant process for the decay of a b quark is $b \to cW^{*-}$, resulting in a flavor correlated c quark and a virtual W. The decay of W boson produces either a $\bar{u}$d or $\bar{c}$s quark pair,both processes are Cabibbo-allowed and $\bar{c}$s is suppressed only by a phase-space factor. We present an analysis of inclusive $B^-$ and $\bar{B^0}$ meson decays to correlated $D_s^+$X and...
Study of Inclusive Decay $\bar{D}^0 \rightarrow K_S X$
Neetesh Mudgal (Belle II Collaboration)
INDIAN INSTITUTE OF SCIENCE EDUCATION AND RESEARCH
(IISER) MOHALI, INDIA
We investigate the inclusive decay mode $\bar{D}^0 \rightarrow K_S X$, where $X$ represents any particle that satisfies the decay condition. Within the Belle...
The collisions of small systems at LHC energies exhibit remarkable similarity with heavy-ion collision by far the collectivity concerned. Measurements of anistropic flow coefficients in pp and p-Pb collision at top LHC energies have shown significant magnitude flow coefficients even at low multiplicity, which is generally attributed to collective dynamics in strongly interacting quark-gluon...
The study on lepton flavour violating (LFV) decays in the framework of the non-universal $Z'$ model delves into several fascinating aspects of particle physics. Focusing on the $\Sigma_b$→ $\Sigma l_1 l_2$ decays, which are induced by the quark-level transition $b→sl_1 l_2$, is especially relevant given the existing experimental constraints on LFV processes. The lepton flavour violating...
Lorentz Invariance Violation (LIV) presents a fascinating opportunity to explore fundamental symmetries, with neutrinos serving as particularly effective probes of this phenomenon. Long-baseline neutrino experiments, such as the Deep Underground Neutrino Experiment (DUNE), are particularly well-suited for investigating non-isotropic LIV, especially through the detection of sidereal effects....
Micro pattern gaseous detectors (MPGDs) represents cutting edge technology in particle detection that is crucial for applications in medical imaging, security screening, and particle physics. These detectors improve the accuracy and efficiency of gas-based particle detection by using electrodes with fine scale patterns, usually on the range of tens to hundreds of micrometers. One kind of MPGD...
One of the primary objectives of high-energy nuclear collisions is to investigate the phase structure of strongly interacting nuclear matter and understand the Quantum Chromodynamics (QCD) phase diagram. This diagram is mapped by temperature (T) and baryon chemical potential ($\mu_{B}$). Lattice QCD calculations at zero $\mu_{B}$ predict a smooth crossover between the hadronic phase and the...
The top quark, being the heaviest known elementary particle, plays a crucial role in fundamental interactions. Predominantly produced through strong interactions, top quark events can include a photon in the final state due to an additional electroweak vertex. Investigating the production of top-antitop pairs(tt¯) with an associated photon offers a unique opportunity to test the predictions of...
Ultra-peripheral collisions (UPCs) of relativistic heavy ions are a tool for studying the photonuclear interactions at the highest LHC energy. UPCs occur when the impact parameter between two colliding nuclei is greater than the sum of the nuclear radii. In UPCs, the photon emitted from one nucleus can fluctuate to a quark-antiquark pair (dipole), which then elastically scatters off the target...
The prime focus of relativistic heavy ion collisions is to study the nuclear matter under extreme conditions to explore the QCD phase diagram. There are various observables to study such matter. One of the important observables is rapidity or transverse momentum dependent strangness production. The strangeness production are studied extensively at RHIC, LHC energies. Researchers observed that...
In this work, we carry out a systematic investigation of thirty six possible structures of neutrino mass matrix, $M_\nu$ having textures of one zero element and one vanishing sub-trace taking the latest $3\sigma$ neutrino data. Correlation plots of the ratio of solar to atmospheric mass splittings, $R_\nu$ and the Dirac CP phase $\delta$ for each texture are examined and found only fourteen...
The $B^{0}\to \gamma \gamma$ proceeds through a flavor-changing neutral current transition involving electroweak loop diagrams. We report a study of the rare decay $B^{0}\to \gamma \gamma$, using data accumulated by the Belle and Belle II experiments and corresponding to integrated luminosities of 694 fb$^{−1}$ and 362 fb$^{−1}$, respectively. The datasets were collected through $e^{+}e^{−}$...
Neutrinos true nature is yet to be known, i.e., Dirac or Majorana. The most practical way to probe Majorana neutrino is by observing the neutrinoless double-beta (0$\nu\beta\beta$) decay. The observation not only confirms the Majorana nature but also constraints the effective Majorana neutrino mass (m$_{\beta\beta}$) and shows the total lepton number is not a conserved quantity. Several...
In this work, we examine the scope of determining the nature of neutrinos in a dissipative environment at long baseline neutrino oscillation experiments. Assuming an open quantum system framework, we analyze the flavor transition probabilities of the neutrinos and anti-neutrinos at different baselines and study the effect of Majorana phase on these probabilities. Additionally, we explore the...
The direct detection of dark matter relies on the rare interactions of dark matter particles with the ordinary matter. The world leading direct detection experiments are mostly sensitive in the 25–40 GeV/c2 WIMP mass and the null results from those experiments have pushed the interest to explore the low WIMP mass region specially below 10 GeV/c2. In this context, the Indian Dark matter search...
We present an analysis of the strong decay of the $\Xi_{c}^{'}$ baryon in the 1P state within the framework of Heavy Hadron Chiral Perturbation Theory (HHChPT), which effectively combines chiral and heavy quark symmetries. This theoretical approach well describes the strong decays of S-wave charmed baryons. Our calculations of the decay width of $\Xi_{c}^{'}$ demonstrate the validity of...
Baryonic decays which involve $b→d$ are very sensitive to new physics effects. Recent experimental observations of $\Lambda_b^0→pK^- \mu^+ \mu^-$ decay motivate the theorist to study baryonic decay [1]. The $\Lambda_b→nl^+ l^-$ decays are forbidden at the tree level in SM. It provides opportunities to test NP models like the leptoquark model [2], two-Higgs doublet model (2HDM) [3],...
The discovery of the Higgs boson in particle physics has opened a new era for valuable research to understand nature better. In recent times, physicists have been trying to find new physics to enhance their knowledge of physics beyond the standard model. For this purpose, studying the effect of modification in Higgs coupling and top Yukawa coupling is essential because it may show physics...
The resonance state $X(3872)$, also known as $\chi_{c1}(3872)$ was discovered by the Belle collaboration in 2003 in the decay $B^+\rightarrow X(3872)K^+$ where $X(3872)\rightarrow J/\psi\pi^+\pi^-$. A lot of theoretical as well as experimental studies have been carried out on this state, but its nature is still not well known. Currently, X(3872) is a strong contender for tetraquark,...
This study investigates the decay modes of the $B_{c}$ meson, focussing on semileptonic decays into S and P wave charmonia. The primary objective is to extract the shape parameter of the $B_{c}$ meson distribution amplitude through a data-driven approach, utilizing $B_{c}\rightarrow\eta_{c},J/\psi$ form factors in modified perturbative QCD framework. Further, by employing heavy quark spin...
This study presents an analysis of the erraticity of produced particles in proton-proton (pp) interactions at a center-of-mass energy of √s = 13 TeV. We utilized datasets generated by PYTHIA v8.3 for our analysis. We calculated several parameters related to chaotic behavior in event space fluctuations, including $χ_{q}$, $ω_{q}$, and the entropy index $\tilde{µ}_{q}$. The results indicate...
A cosmic ray telescope has been designed to analyze the angular distribution of cosmic ray muons. The cosmic ray telescope configuration involves four scintillators, grouped in pairs with each pair separated by a distance. The size of each scintillator detector is 4cm$\times$4cm and the distance between each pair can vary from 10cm to 500cm. Scintillator detectors coupled with SiPMs as the...
study the $p_{T}$ spectra of light-flavor hadrons in different charged-particle multiplicities for $p + p$ collisions at $\sqrt{s} = 7$ TeV
we present the published data of ALICE at the mid-rapidity region to study the $p_{T}$
spectra of light-flavor hadrons in different charged-particle multiplicities
($\frac{d N_{ch}}{d \eta}$) for $p + p$ collisions at $\sqrt{s} = 7$ TeV.
...
The timing resolution of the photomultiplier tubes(PMTs) signals is measured with an accuracy of a few nanoseconds and depends on the PMT size, dynode configuration, applied HV, etc. In large-scale experiments, precise timing is crucial. However, prepulses and afterpulses can degrade the overall time response and trigger conditions of the experiment. We have studied the rate of prepulses and...
The ideal hadron resonance gas (HRG) model, which considers a system of non-interacting point size hadrons and resonances, is successful in explaining the particle ratios observed in high-energy heavy ion collisions. It also agrees with thermodynamic results from lattice QCD (lQCD) calculations up to a temperature of $T\sim150$ MeV. However, the model fails to explain the higher-order...
In this work, the influence of rotation on the electrical conductivity, the thermal conductivity and the elliptic flow of the QGP medium has been explored. The noncentral heavy ion collisions could possess finite angular momentum with a finite range of angular velocity, which results into rotation of the produced medium. Like other extreme conditions, the rapid rotation could conspicuously...
Light dark matter search has emerged as the latest frontier in the direct detection experiments. Small kinetic energy of sub-MeV mass dark matter requires novel target materials and techniques for detection. 2D materials like bilayer graphene with small energy gap could be useful in this regard. Its voltage-tunable sub-eV band gap makes it a promising candidate for a sub-MeV dark matter search...
The Cosmic Muon Veto Detector (CMVD) at TIFR, Mumbai, will be made of extruded plastic scintillators and SiPMs and require an efficiency of $99.99\%$ or better and a false count rate of $10^{-5}$ or lower. To achieve this goal, a suitable high-speed, low-noise electronic DAQ system is required. The SiPM signal will be used for charge measurement for the detection of muons, whereas the trigger...
For decades supersymmetric matrix models of $SU(N)$ gauge theories has been a subject of particular interest. We consider a matrix model of $SU(2)$ gauge theory coupled with a Weyl fermion transforming in the adjoint representation of the gauge group. This model depicts $\mathcal{N}=1$ SUSY with anomalous global $U(1)_R$ symmetry. The matrix model, being quantum mechanical, provides a...
The high luminosity operation of the Large Hadron Collider (HL-LHC) requires radiation hard silicon detectors for precise particle tracking and accurate time stamping of traversing particles. Low Gain Avalanche Detectors (LGADs) offer radiation hard characteristics and excellent time resolution, hence, are planned to be used in future HL-LHC. However, recent studies indicate that the...
Dark Matter (DM), assumed to be thermally produced in the early Universe, stayed in thermal equilibrium until the temperature of Universe dropped due to its expansion, leading to freeze out. Since the temperature was high at this time, the thermal contributions to relic density can be of crucial importance. Working with bino-like models of DM pertaining to WIMP paradigm, and assuming the...
The nature of neutrinos, i.e, whether they are Dirac or Majorana fermions is one of the most intriguing questions in present day particle physics. In the standard oscillation framework, the Majorana phase does not appear in the expression for oscillation probability and hence it is generally believed that it is difficult to probe the nature of neutrino via oscillation experiments. It turns out...
We study null open strings and establish, for the first time, that the worldsheet residual gauge symmetry algebra is the Boundary Carrollian Conformal Algebra (BCCA). We present the construction of open null strings and demonstrate that, under Dirichlet boundary conditions, Boundary Carrollian Conformal Algebra emerges as the algebra of constraints. Additionally, we show that the BCCA can be...
DUNE (Deep Underground Neutrino Experiment) is a future long-baseline
neutrino oscillation experiment hosted by Fermilab. Neutrinos will be
produced by the PIP-II accelerator at Fermilab and detected in the
Liquid-Argon Far Detector, 1300km away from Fermilab in the Sanford
Underground Research Facility. DUNE will also host a Near Detector Complex
574m away from the neutrino source at...
The standard model (SM) assumes identical couplings of electroweak bosons to the three lepton generations, a property known as lepton flavor universality (LFU), whose violation implies the presence of new physics. LFU implies W boson decay rates equal across the three generations. We report a measurement of the LFU ratio $R(\tau/\mu)$ performed using leptonically decaying top quark pairs...
The readout system for the Cosmic Muon Veto Detector (CMVD) includes Counter Mother Boards (CMBs) that interface with Silicon Photomultipliers (SiPMs) located at both ends of each di-counter unit and readout electronics. The di-counter is composed of two adjacent extruded plastic scintillator (EPS) strips. The CMBs are a critical component of the readout system, playing a key role in both data...
The present study investigates the low-lying doubly-charm tetraquark states in the meson-meson interaction picture. The masses of charm mesons are calculated within the Cornell potential framework, including the spin-spin interaction and using Gaussian wavefunctions that include a variational parameter. Monte Carlo sampling is employed to determine the potential parameters, incorporating the...
We studied the possibility of texture zero in the lepton mass matrices in the framework of minimal left right symmetric model using the dihedral $D_4$ symmetry and $Z_2$ symmetry. This leads to interesting correlations between the neutrino parameters. From phenomenological point of view, we consider the observables like neutrinoless double beta decay (NDBD) and charged lepton flavor violation...
The Telescope Array Collaboration recently reported the detection of a cosmic-ray particle, “Amaterasu,” with an extremely high energy of 2.4 × 10^20 eV. No powerful enough candidate sources are located within the region consistent with its propagation horizon and arrival direction, raising question about its origin. This puzzling feature has led to proposals of past astrophysical transient...
The CMS electromagnetic calorimeter (ECAL) at the CERN Large Hadron Collider (LHC) is a high granularity, homogeneous detector composed of scintillating lead-tungstate crystals. Designed to provide exceptional energy resolution for electrons and photons, the ECAL was pivotal in the discovery of the Higgs boson, particularly in the two-photon and two Z boson decay channels. With the upcoming...
The yields of hadrons and light nuclei in relativistic collisions of heavy-nuclei at a center of mass energy of 2.6 TeV can be described remarkably well by a thermal distribution of an ideal gas of hadrons and light nuclei interacting only via the decay of resonances. Given the particularly small binding energy of hypertritons relative to the temperature describing the yields (about 156 MeV),...
The constituents of dark matter are still unknown, and the viable possibilities span a very large mass range. Specific scenarios for the origin of dark matter sharpen the focus on a narrower range of masses: the natural scenario where dark matter originates from thermal contact with familiar matter in the early Universe requires the DM mass to lie within about an MeV to $100$ TeV. Considerable...
Understanding the phases of quantum chromodynamics (QCD) matter has become one of the important research areas for both theoretical and experimental high-energy physics community. In the QCD phase diagram, which is characterised by temperature ($T$) and baryochemical potential ($\mu_B$), a first-order phase transition is expected at high $\mu_B$ and low T, which ends at a possible critical...
A matrix model of Yang-Mills theory coupled to fundamental fermions, which captures key topological features of the full quantum field theory, has been proposed as a numerical approach to study the strong coupling regime of QCD, where nonperturbative effects dominate. Due to its quantum mechanical framework, this model is computationally less intensive than commonly used methods like Lattice...
One of the many probes for Beyond Standard Model (BSM) studies is the search for Charged Lepton Flavor Violation (CLFV). The Mu2e experiment at Fermilab will search for the neutrinoless muon-to-electron conversion in the nuclear field. In Aluminum, the experimental signature of this process is a 104.97 MeV mono-energetic electron conversion. [1]. The Mu2e experiment plans to measure the ratio...
This study undertakes a reconsideration of the potential for a first-order electroweak phase transition, focusing on the next-to-minimal two Higgs doublet model (N2HDM). Our exploration spans diverse parameter spaces associated with the phase transition, with a particular emphasis on examining the generation of stochastic Gravitational Waves (GW) resulting from this transition. The obtained...
Motivated by recent studies of supersymmetric black holes, we revisit the phase diagram of both non-BPS and BPS $AdS_5$ black holes in grand canonical ensemble using recently constructed four derivative effective action. In the universal two derivative theory, for non-BPS $AdS_5$ black holes, three distinct limits exist where the phase diagrams change qualitatively. In the sub critical...
The Compact Muon Solenoid (CMS) electromagnetic calorimeter (ECAL) is made of about 75000 scintillating lead tungstate crystals arranged in a barrel and two end caps. The scintillation light is read out by avalanche photodiodes (APDs) in the barrel and vacuum phototriodes in the end caps. The fast signal from the photodetectors is amplified and sampled at 40 MHz by the on-detector electronics....
In gravitational wave astronomy, radial oscillations help to probe the internal structure and stability of neutron stars (NSs). This study examines static NS models with hadronic and hybrid equation of states (EOSs), focusing on the out-of-equilibrium fluid composition to analyze radial perturbations. Adiabatic sound speeds show smoother trends than equilibrium sound speeds, with the $f$-mode...
In this work, we give two proposals regarding the status of connectivity of entanglement wedges and the associated saturation of mutual information. The first proposal has been given for the scenario before the Page time depicting the fact that at a particular value of the observer's time $t_b=t_R$ (where $t_R\ll\beta$), the mutual information $I(R_+:R_-)$ vanishes representing the...
We conduct an analysis of electromagnetic and semileptonic decay modes of $B_c$ mesons using a QCD-inspired phenomenological model. In light of recent observations of anomalies in LHC involving the $\mathcal{R}$-Ratios, $\tau$-polarization $(\mathcal{P}{\tau})$, and forward-backward asymmetry $(\mathcal{A}_{FB})$ — which are particularly sensitive to New Physics, we investigate observables for...
In the Type-I 2HDM, all the five new physical Higgs states can be fairly light, (100) GeV or less, without conflicting with current data from the direct Higgs boson searches and the B-physics measurements. In this talk, I will discuss how the new neutral and the charged Higgs bosons of the model can be simultaneously observable, resulting from the electro-weak (EW) production. Since the...
In this paper, we study the phase structure and thermodynamic curvature of charged topological Gauss-Bonnet black holes in d-dimensional anti-de Sitter spacetime. By calculating the scalar curvature of the Ruppeiner geometry and analyzing its behaviour near the phase transition, we can gain empirical insights of the microstructure characteristics of the system based on the sign and magnitude...
The $SU(5)$ grand unified model, unifying standard model quarks and leptons into $\overline{5}$ and $10$-dimensional representations, and incorporating only a five-dimensional representation Higgs in the Yukawa sector, yields the observationally inconsistent relation $Y_d = Y_e^T$. We demonstrate that this equality can be modified by introducing quantum corrections in the presence of one or...
We perform the threshold resummation for massive vector boson pair production processes ($ZZ$ and $W^{+}W^{-}$) at the Next to Next to Leading Log accuracy matched with Next to Next to Leading Order fixed order results. We perform the Resummation in the Mellin space, and present our results for the invariant mass distribution to NNLO+NNLL accuracy in QCD for the current LHC energies. We find...
The electron-Ion Collider is designed to scan internal structure of particles like neutron and protons. It is aimed to study some of the important questions in the particle physics for example how quark and gluon contributes to proton spin, mapping quarks and gluons distribution and movements within protons, etc. One of the key challenges at EIC is particle identification (PID), which requires...
Imaging Atmospheric Cherenkov Telescopes (IACTs) have became essential tool for the detection of Very High Energy (VHE) gamma ray sources. IACT data contain overwhelming background of cosmic ray induced Cherenkov images. Conventional methods distinguish signal events from background using shape and orientation features extracted from spatial distribution of time-integrated intensity in camera...
The left-handed chiral structure of the W boson in Standard Model implies that CP violation parameters measured in radiative penguin decays of B mesons should be close to zero due to the suppression of right-handed polarised photon in the final state. Hence these decays are sensitive to physics beyond the standard model through new particles in the loop that can enhance the right-handed...
The GRAPES-3 (Gamma Ray Astronomy at PeV EnergieS phase-3) is a globally recognised experiment that detects cosmic rays over 10 TeV to 10 PeV. It has an unprecedented core-reconstruction resolution of approximately 0.5 meter at 1 PeV. We are planning for a radio-extension to the GRAPES-3 experiment which would demonstrate the state-of-the-art of radio-detection (RD) of cosmic rays in India. We...
Recent discrepancies between the Standard Model prediction of the anomalous magnetic moment of the muon, $a_{\mu}^{SM}$, and experimental measurements, $a_{\mu}^{Exp}$, suggest the possibility of new physics and unknown particles. The proposed J-PARC muon g-2/EDM experiment aims to measure the muon's anomalous magnetic moment with a precision of 460 ppb(sys + stat). This will be achieved by...
In this work we make an attempt to understand the dynamics of bulk viscosity near QCD phase transition. In particular we try to establish a relationship between singular behavior of bulk viscosity near critical region with some underlying symmetry of the system under consideration. We find that it is possible to relate singular behavior of bulk viscosity with the process of spontaneous chiral...
We study the transverse single spin asymmetries (TSSAs) in back-to-back photon + jet production in scattering of unpolarized beams of protons off a transversely polarized proton target, with the aim of using these as a probe of the Gluon Sivers Function (GSF). We provide estimates within the region where the imbalance
$\vec{q}{\perp} \equiv \vec{p}{\gamma \perp} + \vec{p}_{J...
A UV complete model where the Dark Matter (DM) particle interacts with gluons via a colored scalar mediator provides a viable phenomenological model that can be tested at hadron colliders. We consider two cases. First, a zero-jet process where the complete annihilation of Standard Model (SM) particles to DM particles takes place, which contributes to the relic density of DM. The second is a...
A UV complete model where the Dark Matter (DM) particle interacts with gluons via a colored scalar mediator provides a viable phenomenological model that can be tested at hadron colliders. We consider two cases. First, a zero-jet process where the complete annihilation of Standard Model (SM) particles to DM particles takes place, which contributes to the relic density of DM. The second is a...
For scattering cross sections large enough to make the detector in direct searches optically thick to
the incident dark matter, dedicated multi-scatter signatures are being sought. We provide some sig-
nificant updates to the multi-scatter program. First, we refine earlier treatments of the dark matter
flux through detectors, generalizing to arbitrary geometries and velocity distributions....
The Silicon Photomultiplier (SiPM), a relatively new photo-transducer, has been developed since
the last three decades ago. Though it has many advantages over conventional photomultiplier, till now
this has not been used for the precise energy measurements in nuclear and high energy physics,
primarily due to its large intrinsic noise, particularly the correlated noise. The Hamamatsu
...
Event-by-event density fluctuations in the initial stages of hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions are believed to produce correlations among the final state particles in forward and backward regions of the collision beam axis. Diving deep into the study of forward-backward (FB) correlations can reveal insights into the underlying dynamics of particle production...
Driven by the recent anomalies observed in various measurements related to flavor-changing neutral current (FCNC) transitions like $ b \rightarrow s \ell^+ \ell^- $, we conduct a thorough examination of lepton flavor-violating (LFV) decay modes through $ b \rightarrow s \ell_1 \ell_2 $ transitions (where $ \ell_1 \neq \ell_2 $). While LFV transitions are not permitted in the Standard Model,...
Motivated by the recently observed anomalies associated with several observables in the decay modes mediated through flavor-changing neutral current (FCNC) transitions $b \rightarrow s \ell^+ \ell^-$, we undertake a comprehensive investigation of the lepton flavor violating decay modes mediated through $b \rightarrow s \ell_1 \ell_2$ (where $\ell_1 \neq \ell_2$) transitions. Adopting Standard...
Abstract: A 12 layered 1 m × 1 m Cosmic Muon tracker, based on gaseous detector, Resistive Plate Chamber (RPC) [1] has been operational since 2007 in C217, TIFR. This detector has an in-house developed Data Acquisition (DAQ) [2] chain. Hybrid Micro-Circuits (HMC) based pre-amplifiers, Emitter Coupled Logic (ECL) based analog front end and Complex Programmable Logic Device (CPLD) based Digital...
The precise measurements of interactions of the Higgs boson with the particles of the Standard Model (SM), especially electroweak gauge bosons, at the LHC, serve as indirect probes of heavy new physics. To facilitate this, we consider a theoretical framework based on amplitude approach in which the most general amplitude for a process can be factorized into a set of primaries, which are finite...
Discovery of Higgs particle around 125 GeV at the LHC leads to the result that the standard model does not have a stable vacuum to Plank scale. As, for a light higgs boson, SM can be perturbative all the way to Plank scale. So, new physics or new models to be sought. In this work, we focus on a different version of left right model, called Alternative Left Right Model (ALRM), where we study...
The prototype detector of the ICAL experiment at the India-based Neutrino Observatory, the mini-ICAL
is in operation at the IICHEP, Madurai. A Cosmic Muon Veto detector (CMVD) around the mini-ICAL was
planned using extruded plastic scintillators with embedded WLS fibers. A similar system is being
commissioned at TIFR. The SiPM is used as a photo-transducer and that will be calibrated...
Our aim of study is to investigate the mass modification of vector D mesons in the baryonic medium consists of nucleons and ∆ resonances employing the chiral SU(3) Model and QCD sum rules.
The primary objective is to understand the influence of finite density and temperature on the in-medium masses of spin-1 vector D mesons.
In QCD sum rules, the effective masses of D mesons are...
In this paper, we study the inhomogeneous continuous gravitational collapse of spherical viscous matter configurations in a universe with a positive cosmological constant. Using matter fields with a wide variety of initial density and velocity profiles, we observe the evolution of spherical marginally trapped surfaces. This allows us to track the local black hole horizon during the collapse process.
We construct and study traversable wormhole solutions in κ-deformed space-time. The metric of a traversable wormhole is generalized to κ-deformed space-time and the field equations are constructed. Using the field equations and conditions necessary for a wormhole to be traversable, we find constraints on the components of the metric and the velocity of
the traveller. Further, Casimir Energy...
The transverse momentum ($p_T$) spectra of charged hadrons in $p+p$, $p+Pb$ and $Pb+Pb$ collisions
at $\sqrt {s_{\rm{NN}}} = 5.02$ TeV are presented here within the rapidity
range of $-2.5
