Conveners
Poster - 4: D4
- Ambresh Shivaji (IISER Mohali)
- Satyajit Jena (IISER Mohali)
- Vishal Bhardwaj (IISER Mohali)
One of the important concepts that governs the amplitude and phase of energy transmission is impedance. The other is the concept of geometric wavefunction that arises from geometric algebra. While Pauli sigma matrices form the basis of space in 3D, the Dirac matrices are basis vectors of space-time in the geometric representation. Wavefunction interactions are modeled by geometric products,...
The clockwork mechanism is a relatively new mechanism to generate suppressed couplings in a theory containing no small parameters. We develop a new class of clockwork theories with an augmented structure of the near-neighbour interactions along a one-dimensional closed chain. Such a topology leads to new and attractive features in addition to generating light states with hierarchical couplings...
The High-Luminosity Large Hadron Collider (HL-LHC) is the upgraded version of LHC with high luminosity nearly ten times larger than the recorded integrated luminosity at LHC. It will enable physicists to explore well-known systems, including the Higgs boson, in greater detail and identify unusual new phenomena like Supersymmetry (SUSY). SUSY is a widely studied theory of physics beyond...
We propose an E8⊗E8 unification of the standard model with pre-gravitation, on an octonionic space (i.e. an octonion-valued twistor space equivalent to a 10D space-time). Each of the E8 has in its branching an SU(3) for space-time and an SU(3) for three fermion generations. The first E8 further branches to the standard model SU(3)c⊗SU(2)L⊗U(1)Y and describes the gauge bosons, Higgs and the...
The fundamental nature of neutrinos, whether they are Dirac or Majorana fermions, is still unknown and has been an open question for long time. If we consider neutrinos to be Majorana type, then the two flavour neutrino mixing matrix contains a Majorana phase. However, this phase doesn't appear in neutrino oscillation probabilities for vacuum as well as for matter modified oscillations. This...
The nature of neutrinos, whether Dirac or Majorana, is hitherto unknown. Assuming neutrinos to be Dirac, which needs
After a decade of the discovery of Higgs boson the direct search for new particles has put an energy gap between the SM and new physics. In this scenario the framework of effective field theory is the ideal one for going forward. Nowadays its a common practice to explain deviations from SM predictions by incorporating effective operators. We can treat the SM as an effective theory by adding...
Low mass dark matter (sub-GeV/
Dark Matter(DM), having no non-gravitational interaction with standard model(SM), residing in an internally thermalized sector decoupled from standard model may undergo number changing self-scatterings in the early universe. In the non-relativistic regime, these reactions, such as 3
Organic scintillators are capable of providing efficient gamma-ray and
neutron detection in mixed neutron-gamma radiations field. The energy de-
position due to Compton scattered electrons provides major contribution in
response function due to presence of comparatively low atomic number (Z)
elements in organic scintillators. In this work, organic scintillator
EJ-315 is used to study the...
The Belle II detector is located at the SuperKEKB energy-asymmetric
Gamma-ray bursts (GRBs) are the most luminous (events in the Universe after the big bang with
The CMS experiment at CERN uses a two-stage trigger system to filter and store events of physics importance: a hardware-based Level 1 (L1) trigger that uses fast electronics to process data in a pipeline fashion at 40 MHz with an output rate of 100 kHz and a software-based High-Level Trigger (HLT) run on computer farms with an output rate of around 1.5 kHz. Many novel trigger algorithms,...
Coherent Elastic Neutrino-Nucleus Scattering (CEvNS) is a phenomenon in which a neutrino and nucleus collide elastically in a coherent manner. This process involves low-energy neutrinos (having energy between 10keV and a few MeV) and surpasses any other neutrino-coupling scattering cross section by a wide margin, but observing the results has always been challenging due to the tiny recoil...
The non-thermal production of dark matter (DM) usually requires very tiny couplings of the dark sector with the visible sector and therefore is notoriously challenging to hunt in laboratory experiments. Here we propose a novel pathway to test such a production in the context of a non-standard cosmological history, using both gravitational wave (GW) and laboratory searches. We investigate the...
In the Abelian projection of QCD, it has been proved that every charge (electrical or magnetic) of a dyon screens its own direct potential to which it minimally relates and anti-screens the dual potential, resulting in dual superconductivity in accordance with the generalized Meissner effect. A dual superconductivity and confinement-incorporating Abelian Higgs model has been developed and its...
Correlations between multiparticle cumulants and mean transverse momentum in proton-proton (pp), proton-lead (pPb), and peripheral lead-lead (PbPb) collisions are presented as a function of charged-particle multiplicity. This correlation carries information on the origin of flow in small collision systems by showing a characteristic sign change at very low multiplicity. In PYTHIA8 events this...
We make a comprehensive study of vector-like fermionic dark matter and flavor anomalies in a simple extension of standard model. The model is added with doublet vector-like fermions of quark and lepton types, and also a
Dark matter within the framework of minimal extended seesaw
In this paper, we study the prospect of ECAL barrel timing to develop
triggers dedicated to long-lived particles decaying to jets, at the level-1 of
HL-LHC. We construct over 20 timing based variables, and identify two of them
which have better performances and are robust against increasing PU. We
estimate the QCD prompt jet background rates accurately using the "stitching"
procedure...
We have studied different viscous coefficients of thermal QCD medium at finite magnetic field and chemical potential in the kinetic theory approach. The interactions among partons have been incorporated through their thermal masses. It is found that the magnetic field reduces both shear (
We use Machine Learning with an event-generator (Sar
the process:
Sar
in which the first two moments of the Amplitude are stored. In eA collisions the generation of these lookup tables takes many months. I will present a method, using neural networks, which...
More than eighty years after they were first proposed, neutrinos still remain an enigma. Although they are an integral part of the Standard Model, still we know very little about them. In particular, the Dirac or Majorana nature of neutrinos remains a mystery. For a long time, theoretical particle physicists believed that neutrinos must be Majorana in nature and several elegant mass generation...
In order to understand the behavior of the Quark-Gluon Plasma(QGP), heavy quarks can be very essential tools. Our study offers insight into the interaction of the charm quark in the thermalized, deconfined medium. The information about the charm quark interaction in the medium is incorporated into its drag and diffusion coefficients. As the relaxation time of the charm quark is expected to be...
In this paper, we analyse the JLA data on Supernova observations in the context of
A deconfined medium of quarks and gluons called Quark-Gluon Plasma (QGP) is produced when heavy-nuclei are collided at relativistic energies. The formation of QGP is often characterized by a phenomenon called strangeness enhancement where the production of strange-to-non-strange particles are enhanced relative to peripheral or proton-proton interactions. Besides the enhancement in K/π ratios,...
The study of high multiplicity proton-proton collisions has revealed striking similarities with respect to the observations made for nucleus-nucleus collisions.
The understanding of underlying particle production mechanisms in pp collisions is therefore important. Multiplicity and pseudorapidity distributions of inclusive photons are one of the basic measurements to shed light on the physics...
Non-local correlations are typically measured in terms of the Bell's inequality parameter. It was shown that the non-local advantage of quantum coherence (NAQC) is a better measure of non-locality than the Bell's inequality parameter in neutrino systems [1]. We investigate the effects of nonstandard interaction (NSI) on these measurements in the context of many accelerator and reactor...
We study the analytical attractor solutions of third-order hydrodynamic theory under one-dimensional boost-invariant expansion and employ these to analyze the spectra of thermal particles from quark-gluon plasma. We use these analytical solutions to constrain the allowed initial states by demanding positivity and reality of energy density throughout the evolution. Moreover, we evaluate the...
The nature of neutrino(whether Majorana or Dirac), and the origin of neutrino masses are still mysteries to be resolved. Also, the recent results of (g-2)
In the present work, we have studied the electron gravitational form factors (GFFs) in the light-front QED model. We considered the physical electron a composite system consisting of a bare electron and a photon.GFFs are defined in terms of overlap of light-front wave functions. We have also studied the mechanical properties of the electron.
The motivation of the cosmic muon veto (CMV) detector is to explore the feasibility of building a large scale neutrino experiment at shallow depths. Our earlier studies with a small scale experimental setup have yielded encouraging results with cosmic muon veto efficiency of 99.98%. However, a much larger scale experiment is required to establish and improve this result. With an aim to achieve...
The existence of different phases of matter produced in relativistic heavy-ion collisions require a hadronic description, creating much interest in the hadronic phase. We explore the possibility of thermalization and applicability of hydrodynamics in a hadron gas medium using the Knudsen number (Kn). Kn << 1 implies a system with a large number of collisions, thus making the system...
The deconfined phase of QCD called quark-gluon plasma (QGP) created in the relativistic heavy-ion collision experiments is of the size of a few fermi, which is comparable to the characteristic interaction scale. Hence, understanding the effect of the finite-system geometry with a suitable boundary condition is necessary for its theoretical understanding. We study the finite volume effects...
The seesaw mechanism is a popular approach to give a viable explanation for the source of non-zero neutrino mass and for the cause of matter dominance of the Universe - two of the most important open problems that could not be answered in the Standard Model (SM) of Particle Physics. A minimal extension of the SM is studied, incorporating a type-I+II seesaw mechanism with only one right-handed...
Correlations among final-state particles at various pseudorapidity (
Detailed simulation studies using the GEANT4 Simulation tool on the detection of neutrons have been carried out. Based on the guidance through simulation the goal is to carry out an experiment at VECC Kolkata. A mono-energetic neutron beam and neutrons produced from the reactions of alpha and proton beams on the targets of Indium and Tantalum have been used for the studies. It has been planned...
The high granularity calorimeter (HGCAL) is an upgrade to the current CMS endcap calorimeters, designed to deal with the severe radiation dosage expected during the high-luminosity LHC. The majority of the HGCAL will be composed of robust and cost-effective 8" hexagonal silicon sensors, with the last five interaction lengths being based on highly segmented plastic scintillators. Multiple full...
GTMDs are the mother distribution functions from which GPDs and TMDs can be derived under a specific limit. GPDs and TMDs have been used extensively in the literature to understand the 3-dimensional spatial and spin structure of hadrons. We study the GTMDs of quarks in the light-front dressed quark model. Recently it was claimed that extraction of GTMDs of quark and gluon is possible in the...
We systematically calculate the mass-spectra of tetraquarks
In the pre-equilibrium stage of relativistic heavy-ion collisions, strong quasi-classical gluon fields emerge. These dense, coherent, colored electric and magnetic fields are known as Glasma. Glasma fields evolve, and the lifetime of these strong fields is of the order of the formation and thermalization time of the QGP, typically a short fraction of fm/c. Heavy quarks (HQs) are good probes to...
Axion-like particles (ALPs) are weakly interacting particles that are predicted to exist by many beyond standard model theories. A large number of experiments have been constructed or are under construction to search for these ALPs both directly and indirectly (through astrophysical or cosmological observations). In this work we have studied how photon signals originating from the oscillation...
Recent experimental results obtained by the LHCb for the decays through
In standard model (SM) of particle physics neutrinos are massless because of the absence of its right handed counterpart. In several extensions of SM, due to the inclusion of the right handed neutrino, the neutrino flavour mixing matrix becomes nonunitary (arXiv:1503.08879 [hep-ph]). Another way to incorporate the NP beyond SM is the consideration of non standard interaction (NSI) which can be...
We investigate the possibility of two-zeros in inverse neutrino mass matrix (
Current and prospective state-of-the-art low-threshold direct dark matter detection experiments with multi-ton mass scale are promising facilities to probe neutrino properties and study light mediators. Very recently the LUX-ZEPLIN (LZ) and XENONnT collaborations have published initial data from their search for Weakly-Interacting-Massive-Particles (WIMPs). In these experiments, elastic...
In recent years, the flavour changing charged current (FCCC)
The 2m
The current work focuses on the bounce realization and inflationary dynamics of modified Chaplygin gas under the purview of bulk viscosity. The bouncing scale factor considered here corresponds to
With the onset of LHC, several studies of small collision systems (proton-proton and proton-lead) at high multiplicity have revealed collective phenomena similar to those observed in heavy-ion collisions where these effects can be understood through the formation of hot and dense partonic matter, Quark-Gluon Plasma (QGP). However, jet quenching, one of the most important characteristic...
Non-perturbative formulations are essential to understand the dynamical compactification of extra dimensions in superstring theories. The type IIB (IKKT) matrix model in the large-
Gas Electron Multiplier (GEM) detector, one of the advanced members of the Micro Pattern Gas Detector~(MPGD) group, is widely used in High Energy Physics (HEP) experiments. The good rate handling capability and spatial resolution make it a desired tracking detector for high-rate HEP experiments. Investigation of the long-term stability is an essential criterion for any tracking device used in...
The higher twist T-even transverse momentum dependent distribution (TMD)
We discuss leptogenesis in a specific scotogenic model, where the Standard Model is extended by scalar and fermionic singlets and doublets charged odd under a
Radiative transitions between quarkonium states are interesting and are characterized by
Due to the ongoing absence of various well-motivated beyond (the) Standard Model (BSM) signals at the Large Hadron Collider, there is a renewed interest in model-independent search strategies. Autoencoders are a class of neural networks that can learn the properties of complex high-dimensional distribution utilising an information bottleneck, first mapping the input to a lower-dimensional...
In non perturbative Quantum Chromo Dynamics(QCD),potential model formalism has been quite successful in exploring the physical properties of heavy flavored mesons, where the determination of wave function of the concerned heavy flavored meson system is very essential. We employ Dalgarno’s perturbation theory(DPT),Variational method and Variationally Improved Perturbation Theory (VIPT) to solve...
By employing Heavy quark effective theory, we predicted masses of n = 3 strange bottom mesons. Using theoretical information available on charm mesons and flavor symmetry parameters, we calculated masses for radially excited (n = 3) P- wave bottom meson states.
From calculated masses, we plot Regge trajectories in planes (J,
Why is there something instead of nothing? Every particle in nature has it's corresponding antiparticle.In theory as well as in experiments it is seen that particle antiparticle always comes in pairs.Yet we only observe matter in our everyday environment.So does our universe fundamentally favours matter over antimatter?
Was this matter antimatter asymmetry present at the birth of the universe...
Galactic cosmic rays are deflected by the Sun’s magnetic field, leading to significant energy-dependent temporal and spatial variations in their intensity. The muons observed at GRAPES-3 arise from extensive air showers as cosmic ray secondaries originating in the interactions of these cosmic rays with the upper atmosphere. We observe strong correlations between the muon flux measured by...
We have studied weak pion production off the nucleon induced by (anti-) neutrino. The model is built by taking the contribution from non-resonant background terms and the dominant
In this work, we study the phenomenological effects of an eV-scale sterile neutrino in neutrinoless double beta decay and active neutrino masses and mixings. We use
Neutrino physics gives us an opportunity to investigate new physics beyond the standard model. Recent data from the two long-baseline accelerator experiments, NO
According to General Relativity spacetime is curved in the presence of matter. Einstein-Cartan theory is a simple extension of GR where the spin of the matter also affects the curvature of spacetime. This new structure of spacetime requires an affine connection which is no longer torsionless. So, the connection becomes an independent variable alongside the metric. If we want to include...
Over the past ten years, the evidence for charmed mesons has increased rapidly and remarkably in comparison to the bottom mesons [1]. In the bottom sector, however, it is challenging to identify the broad resonance states because of large non-resonant continuum contributions. To date, the experimental groups have confirmed only ground and low-lying excited states of bottom mesons [2-4]. In the...
We present a study of contributions from non-perturbative (NP) effects which include multi-parton interactions (MPI), and hadronization effects in Monte Carlo (MC) event generator HERWIG7 for dijet final states in proton-proton collisions at √s = 13 TeV. As the most precise higher-order predictions of perturbative Quantum Chromodynamics (pQCD) usually do not account for such effects, these...
Several experiments in High Energy Physics and Neutrino Physics use
Resistive Plate Chambers (RPCs) made of bakelite electrodes for more than a couple of decades. There are several future experiments that may use bakelite RPCs. Most of these experiments use bakelite electrodes coated with polymerized linseed oil on their inner surfaces. It has been a common practice for ensuring the long-term...
T2HK is an upcoming long-baseline experiment which will have two water Cherenkov detector tanks of 187 kt volume each at distance of 295 km from the source. An alternative project, T2HKK is also under consideration where one of the water tanks will be moved to Korea at a distance of 1100 km. The flux at 295 km will cover the first oscillation maximum and the flux at 1100 km will mainly cover...
Since the detection of gravitational waves, their interaction with different physical systems has been of interest. We study the phenomenon of parametric resonance of abelian(U(1)) and non-abelian(SU(2)) gauge fields in presence of oscillatory space-time background. Momentum analysis shows modes undergoing parametric resonance enhance small fluctuations initially present in the fields; which...
The discovery of neutrino oscillations i.e. the discovery of neutrino mass, and progress of other experimental observations motivate us to develop models that can address multiple beyond Standard model issues that can be tested using present and future experiments. One such economic model is Ma's Scotogenic model, which generates Majorana neutrino mass at the 1-loop level and includes a dark...
Various astrophysical objects like Neutron Stars, Magnetars, Blackholes, etc. have been extensively studied in the last few decades to predict and analyze observations about such compact objects. Despite the multiple attempts, the exact nature of the matter located inside the core of the above compact objects is still an open problem in Astrophysics. In this work, we attempt to find the...
Abstract: The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR)[1] accelerator complex in Darmstadt, Germany, aims to examine the QCD phase diagram in the area of high net baryon densities using N-N collision. The SIS-100 accelerator ring will produce accelerated beams in the initial phase of FAIR up to the energies of about 30 GeV for...
In this work we examine the model dependence of the stringent constraints on the gluino mass obtained from the Large Hadron Collider (LHC) experiments by analyzing the Run II data using specific simplified models based on several ad hoc sparticle spectra which cannot be realized even in the fairly generic pMSSM models. We first revisit the bounds on the gluino mass placed by the ATLAS...
In this work, we find the bounds on Dirac CP phase, which are consistent with Dark Matter(DM) and neutrinoless double beta (
In the Standard Model(SM), the physics of charm meson is not expected to have new physics(NP) discovery potential because the relevant CKM matrix elements
LHC Run-I and RUN-II data highly constrain masses of electroweakinos in R-parity conserved (RPC) scenarios through various final states usually associated with large missing energy. In R-parity violating (RPV) scenarios the situation may differ depending on various RPV decay modes of the lightest supersymmetric particle. Trilinear RPV coupling term (
The lack of information before Big Bang Neucleosynthesis (BBN) allow us to assume the presence of a new species
A deconfined state of quarks and gluons i.e. QGP (quark gluon plasma) is created in relativistic heavy ion collisions in LHC at CERN and RHIC at BNL and a phase transition to hadronic matter is supposed to occur at around 160 MeV temperature. This extreme state of matter is also supposed to be created after the big bang. On the other hand, in recent times, non-central heavy ion collisions are...
Recently, in 2020 the LHCb Collaboration reported the discovery of four extremely narrow excited
Strangeness enhancement in high-energy heavy-ion collisions remains a key signature to identify the formation of Quark-Gluon Plasma (QGP) in such collisions. The study of strange hadrons and resonances may provide valuable information about the strongly interacting matter produced in heavy-ion collisions. In particular, the resonance particles are important because of their shorter lifetime (a...
We determine the properties of 1P states of Charmonium & Bottomonium in the presence of baryonic chemical potential using Quasi particle approach. Here we employed the medium modified form of Cornell potential which has both Coulombic as well as String part. This enables us to study the properties of heavy Quarkonia even above the critical temperature. Using Quasi particle approach with...
In this work we have carried out the study of Jarlskog like parameter of the neutrino mass matrix with two constrained condition i.e one vanishing minor and zero sum of the neutrino mass eigenvalues. Out of the six possible cases of a neutrino mass matrix with one vanishing minor, we have carried out the study on only three cases i.e
Supernova neutrinos are weakly interacting particles which are produced when a massive star collapses to form a compact object losing 99% of the gravitational binding energy of the remnant in the form of neutrinos with energies a few tens of Mev in a few tens of seconds. They were observed for 1987A core-collapse supernova (SN1987A) in the Large Magellanic Cloud (LMC) , 50 kpc away from...
The construction of a cosmic muon veto detector (CMVD) is in progress to shield the mini-Iron Calorimeter detector at IICHEP, Madurai. The goal of the CMVD is to study the feasibility of a shallow depth (100 m) neutrino experiment. The estimated reduction in cosmic muon flux will be
Transport properties act as crucial probes to analyze the QCD matter produced in ultrarelativistic heavy-ion collisions. Their dependencies on quantities like temperature and chemical potential can help us to locate the phase transition boundary in the QCD phase diagram. In this work, we perform a study of the thermal conductivity, electrical conductivity, and their corresponding diffusivities...
Lorentz invariance is a well-known fundamental symmetry, serving as the pillar of widely accepted theories such as quantum field theory and Einstein’s theory of relativity, and has deep connections with the charge, parity, and time-reversal symmetry. The search for Lorentz invariance violation (LIV) is getting more attention in recent years due to many theories of beyond standard model...
We study the effect of NLO QCD correction merged with parton shower on the distribution of polarization observables that are associated to the top quark polarization and examine the prospect of identifying the genesis of scalar leptoquark by looking into their pair production at the LHC. We study various angular and energy variables at the NLO+PS accuracy to distinguish scalar leptoquarks...
Various observables in the muon sector have shown persistent deviations from the Standard Model (SM) predictions. The muon's anomalous magnetic dipole moment measured by Fermilab has shown a deviation of
