Conveners
Poster - 3: D3
- Ambresh Shivaji (IISER Mohali)
- Vishal Bhardwaj (IISER Mohali)
- Satyajit Jena (IISER Mohali)
A large area (560 m2) muon telescope has been operating in Ooty, Tamil Nadu, as a part of the GRAPES-3 experiment since 2000. The construction of a similar area muon telescope is in progress. The existing muon telescope consists of nearly 4000 proportional counters (PRCs), and a similar number of PRCs have been deployed in the new muon telescope. The signal produced by the PRCs due to the...
We explore the phenomenological implications of one vanishing minor in neutrino mass matrix using trimaximal mixing matrix. We analyse all the six possible patterns of one vanishing minor in neutrino mass matrix for both TM
Transverse spherocity is an event shape observable which is capable of separating pQCD-dominated jetty events from soft QCD-dominated isotropic events. Recent studies show that transverse spherocity can be applied not only in pp collisions but in heavy-ion collisions, which are relatively dominated by soft-QCD processes. We take this scope of transverse spherocity to exploit its use to probe...
The expansion rate of the Universe is modified when the total energy density receives a substantial contribution from a new scalar field, along with the standard radiation energy. This results in a few crucial changes in the set of Boltzmann equations for leptogenesis, governing the evolution of abundance of decaying particle and the lepton asymmetry. Thus the analytical solution of Boltzmann...
In this report, we make a comparative study of Machine Learning (ML) algorithms available in ROOT based TMVA package, when employed for particle discrimination. A dataset from Fermilab's MiniBooNE experiment has been used to accomplish this task. The goal is to distinguish between two flavours of neutrinos, namely electron neutrinos (signal) and muon neutrinos (background). There are 5...
This work demonstrates a viscous extended holographic Ricci dark energy (EHRDE) in a flat FRW universe based on the Israel-Stewart approach. Under the consideration that EHRDE dominates the universe, we study the evolution equation for the bulk viscous pressure
We discuss the consequences of the only Higgs boson in a split-supersymmetric (Split-SUSY) scenario using information theory as a tool which employs branching ratios of Higgs and other experimental constraints. Estimates on preferred values of the SUSY breaking scale and
We present and discuss a new family of topological hairy dyonic black hole solutions in asymptotically anti-de Sitter space. The coupled Einstein-Maxwell-scalar gravity system, that carries both the electric and magnetic charges is solved, and exact hairy dyonic black hole solutions are obtained analytically. The scalar field profile that gives rise to such black hole solutions is regular...
Angular distributions of the decay B+ → K∗(892)+μ+μ− are studied using events collected with the CMS detector in s√ = 8 TeV proton-proton collisions at the LHC, corresponding to an integrated luminosity of 20.0 fb−1. The forward-backward asymmetry of the muons and the longitudinal polarization of the K∗(892)+ meson are determined as a function of the square of the dimuon invariant mass. These...
Resistive Plate Chamber (RPC) is a very popular gaseous detector used in High-Energy Physics (HEP) experiments for triggering and tracking.
Keeping in mind the requirements of detectors having high-rate handling capability, cost-effectiveness, and large area coverage to be used in future HEP experiments, commercially available bakelite plates with moderate bulk resistivity are used to build...
The SuperKEKB colliding-beam accelerator provides e+e− collisions at an energy corresponding to the mass of the Υ(4S) resonance, the products of which are being recorded by the Belle II detector. The mass of the Υ(4S) meson (∼ 10.58 GeV) is just above the threshold for decay into B-meson pairs. We measure the beam energy in the center of mass frame using fully reconstructed neutral and charged...
The profile of a particle in quantum theory is usually formulated as an eigenstate of momentum using plane waves. This is a straightforward and widely used prescription, but it is inadequate because the energy localisation of the particles is completely indescribable.
Due to this spatial non-normalizability, in plane-wave calculations, the frequency of quantum transitions can only be...
We present here a bottomonium suppression study with centrality, transverse momentum and rapidity dependence. The system under consideration is Pb
DEASA (Dayalbagh Educational Air Shower Array) is a ground based mini array to study Air shower phenomena at Dayalbagh Educational Institute[1], Agra in India located at 27.1767° N and 78.0081° E respectively and 170 m above sea level. It comprises 8 plastic scintillation detectors of dimensions (1 m x 1 m x 2 cm) and 2 prototype detectors of dimensions (23.5 cm x 24 cm x 2 cm). The total...
The Dirac scotogenic model provides an elegant mechanism which explains small Dirac neutrino masses and neutrino mixing, with a single symmetry simultaneously protecting the "Diracness" of the neutrinos and the stability of the dark matter candidate. Here we explore the phenomenological implications of the recent CDF-II measurement of the
The charge dependent azimuthal anisotropy of cosmic muon flux at different zenith angles is studied using the mini-Iron Calorimeter (miniICAL) at IICHEP, Madurai. The miniICAL consists of 11 layers of 5.6 cm thick iron plates with 10 layers of 2m
Properties of nuclear matter at density beyond nuclear saturation density (
In this work, we focus on the complementarity between the two upcoming long-baseline experiments: DUNE and T2HK, in establishing the leptonic CP violation at 3
The high-energy astrophysical neutrinos detected by IceCube, with TeV-PeV energies, allow us to test neutrino physics in new energy and distance scales. One possibility is looking for new interactions between neutrinos and matter whose existence would ordinarily be too feeble to detect, except at high neutrino energies. We focus on well-motivated, economical new interactions introduced by...
The measurement of the standard three-flavor neutrino mixing matrix elements with very high precision makes it inevitable to test its unitarity property. So, in this work, we study the ability of the next generation long-baseline experiments DUNE and T2HKK to constrain various parameters relevant for non-unitary neutrino mixing (NUNM) in a complete model-independent fashion. We also discuss...
The chemical abundance of different elements in Universe depends substantially on the nuclear structure and nuclear reactions. In order to determine the premordial
The CERN IT department hosts the HGCAL database (DB), which is based on a framework originally developed at Fermilab. It is now used by several CMS sub-detectors – tracker, calorimeters, and muon system. The DB can be used for detector construction and operation, where each stored component has a unique ID, barcode, serial number, or name. It is also used to track the flow of components from...
We present our analysis of the deconfinement phase transition in the bosonic BMN matrix model. The model is investigated using a non-perturbative lattice framework. We used the Polyakov loop as the order parameter to monitor the phase transition, and the results are verified using the separatrix ratio. The calculations are performed using a large number of colors and a broad range of...
Machine learning (ML) is a rapidly expanding field with a wide range of applications ranging from healthcare to high-energy physics (HEP) research. Deep Learning is a sub-field of ML in which the most basic structure is a neural network. Training such models with a vast amount of pre-processed data allows them to be used for any pattern recognition, classification, or regression problem. These...
We explore
Using renormalisation group equations (RGEs) we study the radiative corrections of different models of neutrino mass patterns at different values of high seesaw scale
We study in detail the viability and the patterns of a strong first-order electroweak phase transition as a prerequisite to electroweak baryogenesis in the framework of
Hot and dense matter created in relativistic heavy-ion collisions exhibits collective behaviour due to multi-particle interactions among the constituents of the matter.
Elliptic flow (the second harmonic coefficient of the Fourier decomposition of the azimuthal angle distribution of particles) is one of the observables to measure the collective behavior in the early stages of heavy-ion...
We evaluate the exact two-photon exchange (TPE) correction to the unpolarized elastic lepton-proton scattering at small momentum transfer using a low energy effective field theory, heavy baryon chiral perturbation theory. The infrared divergent four- point box diagram with one heavy proton propagator is evaluated analytically via photon mass regularization. We present a numerical comparison of...
Muons produced by the interaction of primary cosmic rays in the Earth's atmosphere serve an excellent tool for studying various solar phenomena, primary cosmic ray composition, and gamma ray sources. The GRAPES-3 experiment at the Cosmic Ray Laboratory in Ooty is home to the world’s largest muon telescope. Another muon telescope of similar detection area (560 m
Short-lived hadronic resonances with widely varying lifetimes provide an excellent tool to study the hadronic phase produced in relativistic heavy ion collisions. The dynamics of these particles, especially the
Heavy quarks (charm and bottom) are created during an early stage of the heavy-ion collision via hard scattering. Due to their large mass, they do not get thermalized with the constituents of the quark-gluon plasma (QGP) over the lifetime of the plasma. Hence, they witness the evolution of QGP and are useful probes to study the strongly interacting matter. Heavy quark transport coefficients...
Several heavy-ion collision experiments at RHIC and LHC have been performed in identifying quark-gluon plasma (QGP) matter. In recent times, non-central heavy-ion collisions are of more interests where very [strong magnetic field][1] is produced in the direction perpendicular to the reaction plane. Many theoretical efforts have been made to study the modification of the strongly interacting...
Neutrinos are fundamental particles that can act as a probe for exploring violations of fundamental symmetries such as Lorentz Invariance. Lorentz symmetry breaking is a fundamental violation of space-time symmetry which implies that physical laws vary under Lorentz transformation. We consider the LIV effect which is intrinsic and whose effects exist even in vacuum. We use the Standard Model...
In standard model of electroweak interaction, neutrino charge in vacuum vanishes and this follows from the requirement of anomaly cancelation
In a thermal medium in presence of an external electro-magnetic field,
neutrino can interact with photon, mediated by the corresponding charged
leptons (real or virtual). Thus it acquires an effective charge. In...
We study the effect of interference on the lepton number violating (LNV) and lepton number conserving (LNC) three-body meson decays
Nature of transition from the deconfined quark-gluon state to the confined hadron gas and the location of the critical point are among the various properties in heavy ion collisions that are still a matter of investigation. One of the basic characteristics of the critical behaviour of a system undergoing phase transition is that it exhibits fluctuations of all scales. In recent collider...
We incorporate the isospin mass splittings of
Local multiplicity fluctuations are a useful tool to understand the dynamics of the particle production and the phase-space changes from quarks to hadrons in ultrarelativistic heavy-ion collisions. The study of scaling behavior of multiplicity fluctuations in geometrical configurations in multiparticle production can be performed using the factorial moments and recognized in terms of a...
Quark gluon plasma is detected as a lowest viscous matter of unverse in heavy ion collision experiments like RHIC and LHC because its measured shear viscosity to entropy density ratio remain very close to its quantum lower bound or KSS bound, predicted from string theory calculation. A corresponding lower limit of relaxation time of quarks (and gluons) can be obtained by using the relaxation...
Two-particle electric charge balance function has been measured in proton-lead and lead-lead events with the CMS detector at the LHC. Particle correlations can be used as a probe of the charge creation mechanism, and the balance function is constructed using the like- and unlike-charge particle pairs to quantify these correlations. Compared to previous measurements, the pseudorapidity range is...
In proton--proton collisions, the measurements of beauty-hadron production cross sections are an effective tool to test the perturbative QCD (pQCD) calculations. In addition, they provide the required reference for measurements performed in Pb--Pb and p--Pb collision systems, in order to study the in-medium mass dependent energy loss and the possible effects of cold nuclear matter,...
We formulate a texture 2 zero mass matrix for neutrinos, with charged lepton matrix being diagonal, compatible with the current oscillation data. The proposed matrix is having a minimal structure and hence is very predictive. The predictions of the proposed mass matrix for lightest neutrino mass
High multiplicity proton-proton and proton-lead collisions at LHC energies exhibit similar signatures to those observed in Pb-Pb collisions (i.e. the strangeness enhancement, the ridge behaviours etc.), that were commonly attributed to the formation of the Quark-Gluon Plasma. In this contribution, the measurements of
Heavy quarks (charm and beauty) act as better probes in understanding the formation and evolution of the QCD medium in the ultra-relativistic heavy-ion collisions because of their heavy mass and large relaxation time compared to QGP (quark-gluon plasma) lifetime. Possible thermalization of charm quarks is observed in small systems like proton+proton (pp) collisions by studying charm-hadrons,...
The value of muon magnetic moment, recently, reported by Fermilab has
We introduce a novel hybrid framework combining type I and type II seesaw models for neutrino mass where a complex vacuum expectation value of a singlet scalar field is assumed to spontaneously break CP symmetry. Using pragmatic organizing symmetries we demonstrate that such a model can simultaneously explain the neutrino oscillation data and generated observed baryon asymmetry through...
In this work, we consider an extension of the magic symmetry ansatz within the paradigm of the TM
We present the first results on the resummation of Next-to-Soft Virtual (NSV) logarithms for the threshold production of pseudoscalar Higgs boson through gluon fusion at the LHC. These results are presented after resumming the NSV logarithms of the kind
In the present work, we apply Tsallis non-extensive statistics to study the thermodynamic properties of quark matter in the chiral SU(3) mean field model. Within this model, the quark matter properties are modified through the scalar fields
We analyse
Compared to other neutrino sources, the huge anti-neutrino fluxes at nuclear reactor based experiments empower us to derive stronger bounds on non-standard interactions of neutrinos with electrons mediated by light scalar/vector mediators. At neutrino energy around
NOvA is a long baseline neutrino oscillation experiment based at Fermilab, with the primary aim of studying the properties of neutrinos, the most elusive type of fundamental particle. The experiment measures neutrinos from Fermilab's NuMI beam using two detectors: a near detector located 1 km downstream from the beam source, and a far detector at a baseline of 810 km. Both detectors utilize...
We consider the scenario of self-interacting dark matter(SIDM) with a light mediator in a model independent way, which can alleviate two long standing issues of the small scale cosmology namely cusp vs. core and too-big-to-fail. A Yukawa potential is chosen to achieve mediator exchange between DM particles as part of their self-interactions. The dynamics of self-interacting transfer...
The decays B->Psi(2S)Ks pi+ pi- and Bs->Psi(2S)Ks are observed for the first time based on data samples (2017 and 2018) of pp collision collected with the CMS detector, corresponding to an integrated luminosity 103 inverse femtobarn taken at the centre of mass energy 13 TeV. These decays are observed with a significance exceeding five standard deviations. In this study, the branching fraction...
Neutrinos can acquire both dynamic and geometric phases due to the non-trivial mixing between mass and flavour eigenstates. In this article, we derive the general expressions for all plausible gauge invariant diagonal and off-diagonal geometric phases in the three flavour neutrino model using the kinematic approach. We find that diagonal and higher order off-diagonal geometric phases are...
A strong classical electromagnetic or gravitational background can lead to vacuum instability and produce particle-antiparticle pairs. This extraordinary property of quantum field theory has far-reaching implications for understanding the generation of particle-antiparticle pairs in the presence of a strong electric field[6]; particle creation in the expanding universe[25]; black hole...
An
In this talk, we study the finite temperature properties of a 10-D version of a hardwall model with probe D7-branes and separate cutoffs for the branes and the bulk. In particular, we describe the possible phases and the phase transitions of QCD-like theory in this holographic model.
A cosmic muon veto detector (CMVD) is being built around the mini-ICAL detector at the IICHEP transit campus in Madurai. The CMVD aims to study the feasibility of building a cosmic muon veto for a shallow depth neutrino detector. For this purpose, the CMVD needs to have a muon detection efficiency of more than
Despite successfully explaining most of the global neutrino oscillation data, the three neutrino oscillation framework fails to accommodate the anomalous results from the short-baseline (SBL) experiments during the last two decades. The active-sterile neutrino oscillations with a mass-squared difference (
We study the production of color-neutral and singly-charged heavy leptons at the proposed International Linear Collider. We use the optimal observable technique to determine the statistical accuracy to which the coupling of such fermions to the Z gauge boson (vector, axial or chiral) can be measured in case of signal-only hypothesis as well as in presence of non-interfering SM background. A...
A core-collapse supernova explosion releases 99\% of the progenitor star's gravitational energy in the form of neutrinos resulting in emission of a huge number of MeV neutrinos (
The phenomena of neutrino oscillation is an excellent platform to study new-physics beyond the Standard Model, popularly known as BSM. The unknown couplings involving neutrinos, termed non-standard interactions (NSI), may appear as `new-physics' in different neutrino experiments. The neutrino NSIs may have significant effects on neutrino oscillations and CP-sensitivity, which may be studied in...
To cope with severe radiation dosage and increased event pileup in a high luminosity environment, the existing endcap calorimeters of the CMS experiment will be replaced by a high granularity calorimeter (HGCAL). To make the most of the increased granularity, a precise placement of detector modules into the sampling planes is of utmost importance. This requires the module components’ physical...
We study the quantisation of
Inspired by the resemblance of the Hamiltonian of harmonic oscillator with that of the square of length operator in 2-D space, we propose a method to quantize length and area in 2-D canonical noncommutative space in analogy to the quantization of energy of harmonic oscillator problem. We attempt to extend our method to the case of other canonical noncommutative spaces. In 3-D, we explicitly...
The LHC machine collides proton-on proton every 25 ns. In the recently started operation of Run-3, the peak instantaneous luminosity delivered is about 2 x 10^[34} s-1 cm-2. This results in about ~40 TB/s of data flow from the detector, all of which cannot be stored offline for detailed analysis. The most interesting events are selected quickly via a 2-tier trigger in real time. The first one,...
Vector Boson Scattering (VBS) is widely recognized as an indirect probe for BSM searches in the gauge boson sector which can be described using the standard model effective field theory (SMEFT) approach. However, the EFT formalism is often not applied in a truly consistent manner. In this paper, limitations of the EFT approach to constrain new physics effects in the data are discussed with...
"Scotogenic" Model is a very popular model to explain the dark matter (DM) stability along with the neutrino mass generation in a very simple and elegant way. However, in this model 'ad-hoc'
Motivated by the precise experimental measurements of the heavy flavor baryons in the recent experiments, we have calculated the magnetic moments and radiative M1 decay widths of low-lying heavy flavor charmed baryons for
Recently, Tibet
21 cm line arising from neutral hydrogen is one of the most important tools for understanding the thermal and ionization history of the early universe. Primordial black holes (PBHs) are one of the oldest and well motivated DM candidates. Hawking radiating low-mass PBHs (
Abstract
With the advancement in astrophysical instrumentation, the sensitivity and amount of observations associated with the neutron star are improving continuously. This demands sophisticated theoretical models of its structure and composition. Among its various layers, the crust possesses a challenge due to its complexity and importance in various observed phenomena, such as pulsar...
Motivated by the recently reported anomaly in W boson mass by the CDF collaboration with
We have studied the mass spectra and decay rates of fully heavy pentaquarks systems
In 2020, there are four narrow states of
We study the statistical significances for exclusion and discovery of proton decay at current and future neutrino detectors. Various counterintuitive flaws associated with frequentist and modified frequentist statistical measures of significance for multi-channel counting experiments are discussed in a general context and illustrated with examples. We argue in favor of conservative...
The Deep Underground Neutrino Experiment (DUNE) is a leading experiment in neutrino physics which is presently under construction. DUNE aims to measure the yet unknown parameters in the three flavor oscillation scenario which includes discovery of leptonic CP violation, determination of the mass hierarchy and determination of the octant of
The measurements on lepton flavor universality violation in semileptonic
This contribution study the correlation between two global observables of an event activity i.e. the relative transverse multiplicity activity classifier (
We study the effect of the QCD critical point on moments of fluctuations of experimental observables in theoretical model at energies similar to RHIC beam energy scan (BES) energies. In heavy-ion collision experiments, the QCD critical point can be found via the non-monotonic behavior of many fluctuation observables as a function of the collision energy. Locating the point requires a scan of...
The secondary particles produced by the ultr high energy cosmic rays (UHECR) interacting with the atmospheric atom creates an air showers. The shower produce due to cosmic cascade have different parameters to be studied. The longitudinal and lateral parameter of secondary particles produced by the UHECR has been performed by air extension showers simulation (AIRES). It gives the lateral...
The K_{s}->pi^{+} pi^{-} sample gives access to low momentum pions, which are useful for studying the particle-identification performance. In this work, we have validated the sPlot technique using Belle II simulated sample for K_{s}->pi^{+} pi^{-} at integrated luminosity of 10fb^{-1}. The Belle II is the upgraded experimental facility at SuperKEKB, KEK, Japan. In this work, we study the...
In this work, we explored the hierarchy, octant and CP violation sensitivities of P2O experiment in its three proposed configurations in the standard three-flavor scenario and in the presence of an extra light sterile neutrino. We have compared them with the DUNE experiment results. We have shown that the near detectors are crucial for the study of the sterile neutrinos, as for the far...
Studies of the jet substructure and subject multiplicity in electron-proton neutral current deep inelastic scattering (NC DIS) at the future Electron-Ion Collider (EIC) for
Data are simulated by using two Monte Carlo event generators PYTHIA 8.304 and RAPGAP 3.308.
Jets and subjets...
The initial motivation to study d+Au collisions was to use it as a control experiment to decouple the effects of cold nuclear matter effects in the nuclear modification factors (RAA) obtained from heavy ion collisions like Au+Au. Since the year 2013, there has been a growing evidence of the possibility of formation of Quark Gluon Plasma (QGP) in small systems. Suppression in the nuclear...
Introduction:
For Phase-2 of the operation of the LHC, starting in 2029, CMS will undergo major upgrades to its detectors and readout electronics. A completely new first-level trigger system will ensure that the
excellent physics performance of CMS is maintained or improved under the challenging pile-up conditions in Phase-2. The new trigger system, based on generic ATCA processing boards...
The dark matter (DM) problem has been investigated and discussed
in many papers, within the regime of quantum field theories at zero
temperature. Experimental evidence of DM from various experiments such
as Planck, limits the relic abundance of Dark Matter,
The precision on this result is expected to...
Phenomenologically, from the sign of the Ruppeiner scalar curvature, one can predict the nature of dominant interactions among black hole microstructures. In the extended phase space, thermodynamic geometry has been of special interest for black holes as the singularities of Ruppeiner scalar curvature of the metric signal critical behaviors. Initially, we constructed the thermodynamic...
We measure the forward-backward asymmetry (A6) of the dimuon system and the longitudinal polarisation (FL) of the dikaon system with respect to the squared dimuon mass (q2) using the toy MC samples. The goal is to verify whether in data-like conditions with a similar number of signal and background events, the analysis is able to measure the angular observables of interest (A6, FL). The fitter...
The NuMI Off-Axis 𝛎e Appearance (NOvA) is a long-baseline accelerator based neutrino oscillation experiment designed to study the oscillation of muon neutrinos to electron neutrinos (𝛎𝜇→𝛎e) using a muon neutrino beam. Neutrino spectrum before oscillation is observed at the 290-ton Near Detector (ND) located 100 m underground, 1 km from the source, and after oscillation the spectra is observed...
The prototype detector of ICAL experiment at the India-based Neutrino Observatory i.e., mini-ICAL is in operation at the IICHEP, Madurai. A Cosmic Muon Veto detector around the mini-ICAL is being built using extruded plastic scintillators with embedded WLS fibers to propagate light to SiPMs for detecting scintillation photons. The SiPMs will be calibrated using an ultrafast LED driver. An...
The model of pinning and unpinning of superfluid vortices is considered the most popular explanation behind pulsar glitches. However, the reason behind the almost instantaneous unpinning of a large number of vortices still needs a proper mechanism. We proposed that the neutron-vortex scattering in the inner crust of a pulsar may be responsible for such vortex unpinning. The strain energy...
Assuming that the mixing patterns - tribimaximal (TBM) and golden ratio (GR) mixings are realized at high energy scale, we study the impact of renormalization group equations (RGEs) on neutrino masses and mixings at high energy scales consistent with the cosmological bound on the sum of the absolute three neutrino masses,
