The Large Hadron Collider beauty (LHCb) detector is a single-arm forward spectrometer at the LHC, designed for the study of heavy flavour physics. In this review, an overview of the detector performance and a few recent results in the field of beauty and charm physics are presented. The LHCb experiment has also undergone a major upgrade in preparation for Run 3 of LHC, the talk will also...
The study of photodisintegration of $^7Li$ is of importance to Nuclear Physics, Particle Physics and Astrophysics. Primordial abundances of light elements such as $D$, $^3He$, $^4He$ and $^7Li$ are predicted by Big Bang theory of early universe and is of great interest to cosmologists. Lithium, being fragile gets destroyed easily at relatively low temperatures. WMAP measurements have...
In recent years, cosmological experiments like PLANCK-2018 [1,2] and BICEP/KECK [3] have shown the efficacy of single field slow-roll inflaton potential in explaining various experimental parameters regarding LSS, CMBR anisotropy and polarization data with significant precession. Therefore, obtaining a low energy effective inflationary theory consistent with such a class of potentials from...
The W ± and Z-boson production is extensively studied at hadron colliders since it represents an important benchmark of the Standard Model (SM). In LHC energies, the measurements of W ± and Z-boson in p-p collisions had been done at √s = 8 and 13 TeV. The Electroweak theory and Quantum Chromodynamics (QCD) calculations at Next-to-Leading Order (NLO) and Next-to-Next-to-Leading Order (NNLO) in...
The quark-hadron transition that happens in heavy ion collisions is likely influenced by the effects of rotation and magnetic field, both present due to the geometry of a generic non-head-on impact. The simultaneous imposition of these two phenomenological parameters would lead to a modification of the conventional phase diagram for QCD matter. We explore the deconfinement transition between...
Any grand unified model is plagued with particles capable of inducing
proton decay. Identifying all potential scalar proton decay mediators
stemming from different irreducible representations of SO(10), we
will show their coupling with the Standard Model fermions, tree-level
contributions of the effective strength of $B-L$ conserving ($d=6$),
and $B-L$ violating ($d=7$) operators to...
Feynman integrals at any order of perturbation satisfy the Gelfand-Kapranov-Zelevinsky (GKZ) system of partial differential equations. In an ongoing collaboration, we present the automation of two techniques, namely the Groebner deformation method and the method of triangulations of point configurations, to solve such equations arising in the context of Feynman integrals, in the form of...
We investigate two-body nonleptonic weak decays of bottom meson involving heavy to heavy meson transitions into pseudoscalar and axial-vector mesons. The form factors, decay amplitudes, and branching ratios of CKM-favoured and suppressed modes are calculated in the relativistic and non-relativistic framework within the factorization hypothesis. We find that the branching ratios of several...
We present a background model for TEXONO experiment that is situated in the Kuo-Sheng Neutrino Laboratory under 50-ton passive shielding house. The model includes background contributions from both internal and external contaminations. We adopt the Geant4-based simulation framework to develop the background model, taking into account all contributions from nine radioactive nuclides: 40 K, 208...
The mass spectra of bottomonium $b\bar{b}$, is calculated using Cornell potential in a non-relativistic framework, with spin dependent corrections corresponding to the spin-orbit, spin-spin and tensor interactions added perturbatively. The radial and orbital Regge trajectories are also studied for the same. Further, we estimated the wave function at the origin to predict the decay widths of...
Quantum gravity has been studied using various approaches, and all of these approaches introduce a fundamental length scale in the theory. Non-Commutative space-time is an approach which incorporates this fundamental minimum length scale naturally. Though length scale at which Casimir effect is measured and the scale at which quantum gravity effects are expected are very different, it is...
In the work reported in this paper, we have analyzed generalized Chaplygin gas (GCG) and modified generalized Chaplygin gas (MGCG) in an interacting scenario. The equation of state parameter has been analyzed in both the cases and the stability of the models has been discerned through squared speed of sound. Stability against gravitational perturbations has been observed for both GCG and MGCG...
Jet substructure modification due to different aspects of jet quenching is studied using jet shape and jet fragmentation observables. The jet shape contains information about the transverse energy distribution inside a jet and the jet fragmentation function describes the longitudinal momentum distribution of hadrons inside a reconstructed jet. These measurements provide insight into the jet...
We use an anti-de Sitter/Quantum Chromodynamics (AdS/QCD) based holographic light-front wavefunction for the $J/\psi$ meson, in conjunction with the Color dipole model cross-section to investigate the cross-sections data for exclusive $J/\psi$ electroproduction. We used the dipole model parameters fitted to the most recent 2015 high precision HERA data on inclusive Deep Inelastic Scattering...
In the context of the formation of quark gluon plasma, whether the anisotropic flow in small collision system has the same underlying origin as that of the heavy-ions continues to be a matter of debate. Although the measurements of two and multi-particle correlations apparently suggest that azimuthal anisotropy in small systems is a consequence of collective excitation driven by the initial...
In the light of various CMB missions, the potential offered by AdS swampland conjectures is investigated. Recent CMB observations bound the sixth-order self-coupling of the inflaton field in the AdS swampland conjectures. Current observations can not rule out the inflaton field arising from AdS swampland conjectures.
The experimental measurements of the LFU ratios $R_{D^{(*)}}$, $R_{K^{(*)}}$ and $R_{J/\psi}$ strongly hint the presence of new physics beyond the standard model in $b\rightarrow c\ell\nu_\ell$ and $b\rightarrow s\ell\ell$ transitions, as these values show a tension of about $(2-3)\sigma$ from their standard model predictions. In this work, we investigate the possible manifestation of new...
Minimal $U(1)_{L_\mu-L_\tau}$ extended Standard Model (SM) is well motivated and incorporates the discrepancy between the theoretical prediction and experimental observation of muon anomalous magnetic moment. We study the possibility of identifying the Beyond Standard Model (BSM) Higgs of $U(1)_{L_\mu-L_\tau}$ sector (otherwise required to break the additional symmetry) as the inflaton in the...
In this work we have reported a study on the viscous generalized Chaplygin gas (GCG) in the presence of bulk viscosity and interacting scenario. Reconstruction schemes have been manifested in Einstein and modified $f(T)$ gravity framework. Non-viscous cases have also been taken into account. The equation of state (EoS) parameter has been studied under the various circumstances and the...
A Cosmic Muon Veto Detector (CMVD) is being built around the existing RPC-based Mini-Iron Calorimeter (Mini-ICAL) to study the feasibility of a shallow depth neutrino experiment. The CMVD uses 4.5 m long extruded plastic scintillator strips. A Di-Counter made up of two extruded scintillator strips, is the basic building block of the CMVD. Two fibers embedded along the length of the strips are...
Gas Electron Multiplier (GEM) detectors have been used in various applications because of their outstanding spatial and time resolutions, high-rate handling capabilities, and design flexibility. GEM detectors are a potential instrument for nuclear and particle physics studies. The GEM detector operates in an environmentally friendly and sustainable gas combinations. The purity and quality of...
The problem of late-time cosmic acceleration is one of the critical issues in the scientific community. Various theoretical models that predict the acceleration in the late time phase have been presented. Out of these models, the non-canonical scalar field models have gained lots of popularity in recent years. The tachyon field model is one of these models that has been studied in detail by...
Despite the discovery of the Higgs boson, the Higgs sector of the standard model is still not fully established. In particular, the self couplings of the Higgs boson, and its couplings with gauge bosons, are still to be fully determined. We consider electroweak corrections to the process $H\rightarrow ZZ\rightarrow 4l$. The corrections depend on the $HHH$ and $ZZHH$ couplings. We investigate...
The signature of noncommutativity on various measures of entanglement has been observed by considering the holographic dual of noncommutative super Yang-Mills theory. We have followed a systematic analytical approach in order to compute the holographic entanglement entropy corresponding to a strip-like subsystem of length l. The relationship between the subsystem size (in dimensionless form)...
Emission properties of the Astrophysical objects such as Neutron Stars are found using mass, pressure profile and thermal cooling rate. In this current work, we determine the cooling rate of spherically symmetric neutron star as a function of time and distance from the star's centre using NSCool code. Here we first find the mass, pressure and baryon number density profile of the non-rotating...
Energy dependence of information entropy is examined using the multiplicity distributions(MDs) of produced charged particles in pp collisions at ISR, SPS and LHC energies. The findings reveal that MDs at these energies exhibit a new type of scaling if the variable involved is the 'Information entropy' of the distribution, $S = -\Sigma Pn ln Pn$. Similar entropy scaling has also been observed...
We present a new methodology to perform the epsilon-expansion of hypergeometric functions with linear epsilon-dependent Pochhammer parameters in any number of variables. Our approach allows one to perform Taylor as well as Laurent series expansion of multivariable hypergeometric functions. Each of the coefficients of epsilon in the series expansion is expressed as a linear combination of...
The concept of dark energy has been proposed to explain the observed accelerated expansion of the universe. One popular and trivial choice of source of dark energy is the scalar field. We choose the tachyonic field, one of the scalar fields, as a candidate for dark energy and discuss it in a model where matter and dark energy (tachyonic scalar field) are allowed to interact with each other....
In this work, we have discussed how a multivariate algorithm, namely XGBoost, can deal with the disagreement between data and simulation in any analysis. The goal is to train the model in the control channel and extract scale factors which can be used for event re-weighting in the corresponding signal channel. In $B_{s}\to \phi\mu^{+}\mu^{-}$ analysis, $B_{s}\to J/\psi\phi$ is the...
Straw tubes are drift chambers made of a gas filled conducting cylinder acting as cathode, and a wire stretched along the axis of the cylinder acting as an anode. The Straw Tube Trackers (STTs) are a low mass tracking system with excellent vertex, momentum, angular and time resolution, and particle identification. Straw Tube based tracking detector is proposed for one of the Near Detectors in...
Chiral Magnetic Wave (CMW), induces electric quadrupole moment in quark-gluon plasma produced in heavy-ion collisions, which removes degeneracy between elliptic flow of positively and negatively charged particles [1]. The charge-dependent elliptic flow as a function of the charge asymmetry ($A_{ch}$) serves as an important tool for study of CMW. We performed this study on 13.5 million Au+Au...
The Non-Standard Interactions (NSIs) are subdominant effects due to unknown couplings of neutrinos, often appearing in various extensions of the Standard Model, which may impact the neutrino oscillations through matter. It is important and interesting to explore the impact of NSIs in the ongoing and upcoming promising neutrino oscillations experiments. In this work, we have probed the imprints...
Isolated ideal neutron stars (NS) of age $>10^9$ yrs exhaust thermal and rotational energies and cool down to temperatures below $\mathcal{O}(100)$ K. Accretion of particle dark matter (DM) by such NS can heat them up through kinetic and annihilation processes. This increases the NS surface temperature to a maximum of $\sim 2550$ K in the best case scenario. The maximum accretion rate...
In the vicinity of Planck length scale, only where the quantum gravitational effects are expected to be observed, any attempt towards localization of an event inevitably results in gravitational collapse. To avoid such a scenario one needs to postulate noncommutative algebra between space-time coordinates, which are now promoted to the level of operators. On the other hand, a consistent...
The light sea quark distribution functions $\bar{d}(x)$ and $\bar{u}(x)$ have been calculated explicitly for proton using the chiral constituent quark model which has connotation of chiral symmetry breaking and SU(3) symmetry breaking. In view of the latest SeaQuest data the results have been discussed thoroughly for the light antiquark asymmetries and the Gottfried integral.
Correlation between the various observables, like, multiplicity, sum of event transverse momenta or the net charge of particles produced in pp collisions at LHC energies within intervals separated in pseudorapidity and azimuth angle is regarded as a sensitive tool to investigate the collision dynamics and test the models of hardon production. In the present work forward-backward (FB)...
Within the framework of the symmetric-asymmetric Gaussian barrier distribution (SAGBD) approach, the fusion cross-sections for 12C + 144,154Sm reactions are theoretically analyzed in the energy range lying below to well above the Coulomb barrier. In the SAGBD approach, the multidimensional nature of nuclear interaction potential is included by using a Gaussian type of weight function within...
We revisit the status of asymptotic symmetries in higher even dimensions and propose a definition of superrotation charge beyond linearized gravity. We prove that there is a well-defined spacetime action of the superrotation charge on the space of asymptotically flat geometries. Additionally, we demonstrate that the Ward identity associated with superrotation charges follows from the...
Left-Right symmetric models have been a natural extension to the standard model based on the fact that the standard model is predominantly left-handed. So it is normal to think that the left-right symmetry is restored at high energies. The spontaneous breaking of this left-right symmetry depends on the specific model and the minimal model involves extra Higgs triplets or doublets to give rise...
Existing endcap calorimeters of the CMS experiment cannot cope with the radiation or pileup expected during the high-luminosity operation of the LHC. Their jet energy resolution also needs to be augmented in order to enhance the physics reach of the experiment. At high jet energy, a correct association between the charged particle tracks and the calorimetric clusters is very important,...
The most dominant but experimentally difficult decay channel of the HIggs boson, into a pair of bottom quarks
has already been established using the Higgs boson production associated with a vector boson (VH, V = W or Z),
when V decays leptonically. The relatively more abundant and the second largest Higgs boson production mode,
the vector boson fusion (VBF) process, is suitable to...
In 1988 the European Muon Collaboration (EMC) at CERN shocked the physics community by announcing that the sum of the spins of the three quarks that make up the proton is much less than the spin of the proton itself, later on which is known so-called "proton spin puzzle." Physicists have been unable to answer a seemingly simple question: where does proton spin come from? How the proton’s spin...
In particle physics, the Glashow-Weinberg-Salam (GWS) model of the electroweak (EW) interactions describes the fundamental parameters, i.e, coupling constant ($\alpha_{EM}$), Fermi constant ($G_{F}$), W boson mass ($M_{W}$), Z boson mass ($M_{Z}$) and $\theta_{W}$, referred as the Weak Mixing Angle or the Weinberg Angle. This angle is a fundamental parameter in the Standard model (SM),...
Collectivity is an essential feature of the strongly interacting matter formed in the deconfined phase of quarks and gluons in the collisions of nuclei at relativistic energies. Experimentally such collective behaviour has been observed in heavy ion collisions at RHIC and LHC energies. The other observations, like strangeness enhancement, also support the existence of quark-gluon plasma in...
At collider machines operating at energies much above the electroweak scale, all Standard Model particles will appear essentially massless, including the nominally heavy ones. The kinematic consequences of this can make the signals for the Standard Model, and for other models, very different from the signals at the LHC or other colliders of the past. These differences are explained and some of...
The origin of cosmic ray particles is still largely unknown since they are
deflected on their journey to the Earth by magnetic fields. However, very high
energy (VHE) photons that can be produced by both leptonic and hadronic
processes, are attenuated by extragalactic background light, i.e. they cannot be
probed distances larger than z ∼ 1 at energies above ∼ 1 TeV. In comparison,
only...
With the increasing complexity and growing volume of data taken by the current experiments, the enormous challenge of isolating potential BSM signatures from the known Standard Model(SM) footprints is an active area of research in HEP. Machine learning (ML) algorithms are appropriate for analyzing large amounts of data and can find more intrinsic patterns in multidimensional data. We explored...
We investigate the nature of the complex retarded potential of a heavy quark moving in a hot and dense static quark gluon plasma. The well-known concept of the retarded potential in electrodynamics is extended to the context of the heavy-quark by modifying the static vacuum Cornell potential through Lorentz transformation to the static frame of the medium. The resulting potential in the vacuum...
In this work we calculate the time evolution of local gauge invariant field theoretical model, comprising
of a scalar field coupled to vector gauge field. Assuming a linear relationship between phase angles
α(x) at two closely separated space-time points x and x′ = x − δ, with 0 < δ < 1, we obtain an explicit
dependence of scalar field φ(x) at x and x′ in terms of Wilson-line variable....
Most of the hadronic B decays observed proceed through a "D" meson (D, D$^*$, D$^{**}$) , as b$\rightarrow $c transitions dominate among other b transitions. D$^{**}$ indicates the collection of non-strange charm mesons falling in the mass range of 2.2 - 2.8 GeV/c$^2$.
We present the study of B to charm decays in the Belle experiment with 711 fb$^{-1}$ electron-positron collision data...
The decay D^{0}->K_{s}K_{s} is a singly Cabibbo-suppressed transition that involves the interference between cubar->ssbar and cubar->ddbar amplitudes, mediated by the exchange of a W boson at the tree level, that can generate CP asymmetries at the 1% level, even if the Cabibbo-Kobayashi-Maskawa phase is the only source of CP. Current experimental measurements of the CP asymmetry in...
Detection of delayed sub-TeV photons from Gamma-Ray Bursts (GRBs) by MAGIC and HESS has proved the promising future of GRB afterglow studies with the Cherenkov Telescope Array, the next-generation ground-based gamma-ray astronomy observatory. With the unprecedented sensitivity of CTA, afterglow detection rates are expected to increase dramatically in the coming decade. We embark on exploring...
NO$\nu$A is a long-baseline accelerator neutrino experiment at Fermilab that aims at precision neutrino oscillation analyses and cross-section measurements. Large uncertainties on the absolute neutrino flux affect both of these measurements. Measuring neutrino-electron elastic scattering provides an in-situ constraint on the absolute neutrino flux. In this analysis the signal is a single, very...
Next-to-next-to-leading order (NNLO) QED corrections are an important ingredient for different low-energy experiments such as MUonE, MUSE, and P2. In this talk, we will discuss the computation of such higher-order corrections to different observables relevant to the above experiments. To compute these corrections it is important to keep the masses of leptons finite, which regularises the...
In the current study we are demonstrating a bounce cosmology with generalized holographic cutoffs. The bounce realization arising from the application of holographic principle has been demonstrated with a modified gravity framework. Considering a multiplicative bouncing scale factor we have shown the four types of singularities. For this scale factor we have consider a scenario having...
DUNE (Deep Underground Neutrino Experiment) is a long baseline neutrino oscillation experiment that is currently being built to study the $\nu_{\mu}-\nu_e$ oscillations, which will eventually help in determining the neutrino mass-hierarchy, CP violation in the lepton sector and many other exciting areas of particle physics. A Near Detector (ND) Complex comprising three detectors - ND-GAr,...
Exploration of entanglement entropy and obtaining the Page curve in the context of eternal black holes associated with top-down holographic duals of QCD-like theories at high temperatures and intermediate coupling, has been missing in the literature. In this talk, I will explain how we obtain the Page curve of an eternal black hole relevant to the M-theory dual of thermal QCD-like theories at...
Anjali S and Saurabh Gupta
Department of Physics, National Institute of Technology Calicut,
Kozhikode - 673 601, Kerala, India
E-mail: anjalisujatha28@gmail.com
Abstract: We investigate a system of particle constrained to move on a torus knot via the framework of superfield formalism and derive the off-shell nilpotent and absolutely anti-commuting...
We report various energy reconstruction algorithms used by the CMS hadron calorimeter (HCAL) during the LHC Run-2. The signal pulse of deposited energy in the HCAL subdetector is a function of time, and hence it overlaps with adjacent pulses due to the high pileup scenario and short proton-proton bunch crossing time (25 ns). The correct contribution of the signal pulse can be estimated using...
We consider two BSM scenarios with scalar leptoquarks (LQ), motivated by neutrino mass, muon $g-2$, and anomalies in $B$-decay ratios. A combination of a singlet and a doublet scalar LQ can generate one-loop Majorana neutrino mass, and contribute to the observed muon and electron $g-2$ values, while satisfying bounds from lepton flavour violating decays. A carefully chosen parameter space in...
Neutrino oscillation experiments use nuclear targets to achieve the necessary interaction events to improve statistics. The inevitable nuclear effects arise due to the sophisticated nuclear environment and our poor understanding of the neutrino interaction with the targets gives rise to systematic uncertainties in the determination of neutrino oscillation parameters. In order to precisely...
Following the discovery of the Higgs boson by the ATLAS and CMS experiments at the LHC, began the zeal for measuring its coupling with other Standard Model (SM) particles. The Higgs Yukawa couplings to light quarks (u,d,s) are currently unknown and the study of inclusive decays of the Higgs boson to these states are extremely challenging due to the large multijet background. In this scenario,...
We study the possibility of existence of deconfined quark matter in the core of neutron stars and non-radial oscillation modes in neutron and hybrid stars. A relativistic mean field model is used to describe the nuclear matter at low densities and zero temperature while Nambu--Jona-Lasinio model is used to describe the quark matter at high densities and zero temperature. A Gibbs construct is...
The Time Projection Chamber (TPC) [1] has the capability of three-dimensional particle tracking. We are developing a bulk Micromegas [2] based prototype TPC at SINP. In the present work, we have measured the detector gain, energy resolution, and electron transparency of the 128 um Micromegas in argon-based gas mixtures to optimize the operating drift and amplification field. We observe the...
In this paper, we attempt to find the neutrino oscillation parameters at low energy scale from high energy scale input values. These oscillation parameters are generated through radiative corrections under renormalization group equations (RGEs) in minimal supersymmetric model (MSSM). We assume that some particular symmetries exist at very high energy scale and such symmetries can lead to...
Resistive Plate Chamber (RPC) is a gaseous detector, which is going to be used as an active detector element for the Iron CALorimeter (ICAL) experiment, which is planned to be built by the India-based Neutrino Observatory (INO). A gas mixture consisting of R134a (95.2%), Iso-Butane (4.5%) and SF6 (0.3%) is used to operate the RPCs in the Avalanche mode. Composition of gas mixture plays a...
Relativistic dissipative hydrodynamics is an effective macroscopic theory of a near-equilibrium system. It is a tool to explore the collective behaviour of the strongly interacting medium produced in heavy-ion collisions. The ideal hydrodynamic simulation deals with the evolution equations of hydrodynamic variables derived from the conservation laws using the equation of state as an input. To...
Hadronic resonances are a unique tool to study the properties of the hadronic phase created after high energy collisions via regeneration and rescattering of their decay products. Studying the dependence of the yield of resonances on transverse spherocity and multiplicity allows us to understand the resonance production mechanism with event topology and system size, respectively. Furthermore,...
A simulation-based projection study has been performed for a search for a vector-
like top quark partner T in proton-proton (pp) collisions at √s = 14 TeV. The search
considers the operational conditions of the High-Luminosity LHC (HL-LHC). The
production pp → TT is followed by the decays T → bW, T → tH, and T → tZ with
equal branching fractions of 1/3. Events with one electron or muon,...
A search for high mass resonances decaying into a pair of W bosons is presented. The analysis is based on proton-proton collisions observed by the CMS experiment at the CERN LHC for full Run 2, corresponding to an integrated luminosity of 138 fb−1 at sqrt(s) = 13 TeV. The analysis considers the fully leptonic final state . New techniques are implemented in the analysis to improve the...
The conservation of lepton flavor is one of the accidental symmetries of the SM. Charged lepton flavor violating processes are forbidden in the SM. Still, some new physics models, such as the leptoquark model, predict these processes that could be observed in a high-energy physics experiment.
Bottomonium system is a good place to study such processes. Belle experiment is a flavor physics...
We search for the decay $B_s^0\rightarrow J/\psi \pi^0$ using 121.4 $fb^{-1}$ of data collected at $\Upsilon(5S)$ resonance state by the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider located at the High Energy Accelerator Research Organisation, KEK, in Japan. In the Standard Model, the decay is expected to be rare, proceeding through the $W$-boson exchange and annihilation...
The CDF-II collaboration’s recent high-precision measurement of $W$ boson mass, $M_{W}^{\text{CDF}}$ = 80.4335 $\pm$ 0.0094 GeV, indicates $7-\sigma$ deviation from the SM expectation $M_{W} = 80.354 \pm 0.007$ GeV. This leads us to investigate the extension of SM, which can account for aforementioned problems with SM. We investigate the possibility of the well-known canonical Scotogenic...
During peripheral heavy ion collisions in RHIC and LHC experiments, a huge magnetic field can be created. So, quark gluon plasma (QGP), produced in this heavy ion collision experiments, can face this strong magnetic field, which can decay with time. The electrical conductivity of QGP can be guiding quantity for this decay profile of the magnetic field. Present work has tried to explore the...
Neutrinos are massless in SM but one can introduce Majorana neutrino masses effectively through a dimension-five lepton number non-conserving operator $-\mathcal{L}_\nu^{d=5}=\frac{1}{\Lambda}(\overline{L}\Phi)(\Phi^TL^c)+h.c.$. The linear seesaw mechanism provides a interesting UV-completion of this operator realized in the simplest $SU(3)_c\otimes SU(2)_L\otimes U(1)_Y$ gauge structure. In...
We propose a two-component fermionic Dark Matter(DM) in a minimal
U(1)B extension of Standard Model(SM) with the inclusion of one complex
scalar S(1, 1, 0, −3) along with the usual Higgs doublet. Out of the 3 exotic
fermions added for anomaly cancellation, DM emerges as a mixture of the neutral component of the fermionic doublet and a singlet fermion. The motivation of
our work lies in the...
We analytically calculate the conversion probability $P_{\mu e}$ in the presence of sterile neutrinos, with exact dependence on $\Delta m^2_{41}$, and with matter effects explicitly included. Using perturbative expansion in small parameters, we show that the terms involving mixing angles $\theta_{24}$ and $\theta_{34}$ can be separated out, with the effects of the latter only arising due to...
Measuring the trilinear Higgs self-coupling parameter $\lambda_{HHH}$, which crucially describes the shape of Higgs potential, is among the key mandates at the Large Hadron Collider (LHC) experiments. In proton-proton collisions, this coupling can be probed directly by studying the production of the Higgs boson pair. Due to the rarity of the HH production signal, the analysis usually requires...
We have provided a modified grand canonical ensemble formulation for a multi-component hadron resonance gas system. We have considered the attractive as well as repulsive interaction among the constituent baryons (antibaryons) and obtained a Van der Waals type equation of state. The weak decay contributions of the heavier resonances have also been taken into account. Using our formulation we...
The measurement of the production cross section and transverse momentum ($p_T$) spectrum of $Z$ boson at the LHC provides first tests of the Standard Model (SM). This measurement could be sensitive to exotic physics processes in new energy regime. The $Z$ boson production is also a common background process for many other physics analyses and therefore it must be well understood. In this...
The superconformal bootstrap program for $\mathcal{N}=2$ superconformal field theories was initiated by Rastelli.et.al. The main ingredient for bootstrapping any CFTs is a four point function and which can be expressed interms of conformal partial waves. In this work we have computed the superconformal partial waves of the four-point correlator $\langle JJ\Phi\Phi^{\dagger}\rangle$, in which...
We revisit the symmetries of an isolated horizon (IH), exploiting some freedom in the choice of intrinsic data. The supertranslations are realized as additional symmetries. Furthermore, it is shown that all smooth vector fields tangent to the cross sections are Hamiltonian. We show that joining two IHs which differ in these Hamiltonians and boundary data, under the action of a...
A long-baseline Deep Underground Neutrino Experiment (DUNE) is a novel and ambitious setup which will come-up in midwestern United State.This world class laboratory will not only address the fundamental questions about the nature of elementary particles and their role in the universe but it aims to announce groundbreaking discoveries.
In DUNE the measurements of neutrino oscillation...
We consider the twisted-diffeomorphism framework of canonical noncommutative spaces in which the noncommutative version of metric tensor, Christoffel symbols, curvature tensors and curvature scalars are constructed in terms of their commutative counterparts. Further, we consider the two commutative spaces that are related to each other by a non-injective coordinate transformation i.e., a...
While the triplet-like Higgses up to a few hundred GeV masses are already excluded for a vast region of the model parameter space from the LHC searches, strikingly, there is a region of this parameter space that is beyond the reach of the existing LHC searches, and doubly/singly-charged and neutral Higgses as light as 200 GeV or even lighter are allowed by the LHC data. We study several search...
The flavor symmetry-breaking scale of the Froggatt-Nielsen (FN) mechanism is very weakly constrained by current experiments and can lie anywhere from a few TeV to the Planck scale. We develop ultraviolet (UV) complete models that generate the FN mechanism, with a global $U (1)_{\rm{FN}}$ flavor symmetry for two commonly used charge assignments. We explore the possibility of a strong...
We consider canonical noncommutativity among spacetime coordinates which gives rise to twisted Conformal algebra and twisted Poincare algebra. Different aspects of Weyl Tensor in four-dimensional noncommutative spacetime are discussed. We calculate the noncommutative correction to Weyl Tensor in noncommutative Minkowski spacetime in Spherical polar coordinate and Conformally compactified...
We study the possibility of generating baryon asymmetry of the universe from dark matter (DM) annihilations during non-standard cosmological epochs. Considering the DM to be of weakly interacting massive particle (WIMP) type, the generation of baryon asymmetry via leptogenesis route is studied where WIMP DM annihilation produces a non-zero lepton asymmetry. Adopting a minimal particle physics...
I will present a brief overview of astrophysical and cosmological constraints on dark matter and dark energy.
Charged lepton flavor violation has long been recognized as an unambiguous signature of New Physics. Here, we describe the physics capabilities and discovery potential of New Physics models with charged lepton flavor violation in the tau sector as its experimental signature. Current experimental status from the B-Factory experiments BaBar, Belle and Belle II, and future prospects at Super Tau...
A review of DPS measurements from CMS experiment will be presented. A comparison of these results with respect to measurements from other experiments will also be shown.
In a hard interaction at the LHC, the partons due to the QCD confinement property hadronize to form jets. The identification of jets and flavor tagging of jets is very important to many physics analyses for precise measurements of the standard model and new resonance searches. The performance studies on identifying the quark and gluon jets using different discriminators and their tagging...
Several indications of lepton non-universality observables have been perceived in semileptonic $B$ meson decay processes, both in the neutral-current ($b \to s ll $) and charged-current ($b \to c l \bar \nu_l$) transitions, recently. Influenced by these fascinating quotients, we examine the semileptonic decays involving the $b \to c l \bar \nu_l$ quark level transitions. We execute it...
It is the most common assumption is that the pressure inside the neutron star (NS) is isotropic in nature. In this study, we calculate the anisotropic pressure inside the NS and calculate its effects on some properties such as mass, radius, compactness, and surface curvature. To obtain the NS properties, we use the relativistic mean-field equation of states. We observed that anisotropy has...
The top quark is the heaviest known elementary particle. It has deep connections to the electroweak symmetry breaking mechanism owing to its large mass. It decays faster than average time required for hadronization, thus enabling direct access to bare quark properties. Top quarks often serve as the window to new physics via its direct couplings to heavy resonances predicted by theories beyond...
The GRAPES-3 experiment located at the Cosmic Ray Laboratory in Ooty India is home to the world’s largest muon telescope. It consists of 16 modules based on nearly 4000 proportional counters (PRCs). Another muon telescope of similar area is under construction. The old data acquisition (DAQ) system of the muon telescope is a conventional one which works on a hardware trigger generated by the...
Recent image of the M87* and Sgr A* black hole by EHT collaboration has opened a new portal to unlock various mysteries of the universe. Due to extreme gravity around a black hole, there will be an enhanced distribution of dark matter, which will have a significant effect on the image of the black hole. One certain feature of a black hole image is the black hole shadow, which can be used...
LHC's Run-3 officially started in July 2022 with LHC delivering first beam at record energy of 13.6 TeV. It is for the first time when LHC experiments are using full software triggers based on GPUs capable of doing full event reconstruction at 30 MHz proton-proton collision rate.
In this talk, I will cover the design architectures and programming principles of Run-3 High level triggers (HLT)...
Measurements of heavy-flavour tagged jets, and heavy-flavour particle azimuthal correlation with charged particles allow for comparisons of the heavy quarks (charm and beauty) production, propagation, and hadronization across different collision systems. Comparison of measurements performed in pp with p--Pb collisions can help studying the possible modification of the heavy-quark production...
The hierarchical structure of fermion masses and mixings is a major unsolved problem in the Standard model. Fermion masses as radiative corrections emerge as one of the reliable explanations for this problem. We propose a framework based on a class of abelian gauge symmetries in which the masses of only the third generation quarks and leptons arise at the tree level, and the lighter...
We report a precise simultaneous measurement of the mass and decay width of the top quark in the $t$-channel, which is the most dominant production process for single top quarks at the LHC. The final state comprises a top quark along with a light quark, giving rise to at least two jets, of which one arises from the hadronization of b-quark, an isolated high-momentum lepton (electron or muon),...
At TIFR, we are participating in the development, fabrication and assembly of intricate stepped and non-stepped hole (NSH) frontend electronics boards, baseplates with insulation, and large area Copper-Tungsten (25:75) composite material plates, to be used as an absorber in the electromagnetic section of HGCAL. The overall development employs close interaction with Indian electronics and...
Jet energy loss is investigated using the nuclear modification factor (R$_{AA}$) observable in heavy ion collisions at RHIC and LHC energies. We employ Jet Energy-loss Tomography with a Statistically and Computationally Advanced Program Envelope (JETSCAPE) framework to depict jet quenching phenomena, to analyze the multi-stage jet evolution in quark-gluon plasma (QGP) medium. In this work,...
The measurement of CP violating weak phase $\phi_s$ is achieved using the data collected by the CMS experiment at $\sqrt{s}=13$ TeV in the sample of 48500 reconstructed $B^0_s\rightarrow J/\psi \phi \rightarrow \mu^+\mu^-K^+K^-$ events corresponding to an integrated luminosity of 96.4fb$^{-1}$. The parameters are extracted by performing a time-dependent and flavor-tagged angular analysis of...
We reconstruct late-time cosmology in a model-independent manner using the technique of Principal Component Analysis (PCA). We propose a variant of PCA which can be used to find out the functional form of late-time cosmological quantities. In the methodology we only need the tabulated dataset of the quantity we want to reconstruct and as an output we get the functional form of it in terms of...
In this talk, I will show applications of the state-of-the-art supervised, un-supervised and weakly-supervised machine learning (ML) algorithms to solve problems in cosmology and astronomy. I will show ML-based galaxy clusters' mass modeling to capture the Sunyaev Zel'dovich (SZE) and Cosmic Microwave Background (CMB) lensing effects, using convolutional neural networks (CNNs). I will show an...
Recent results in high-multiplicity pp collisions show features similar to those that are associated with the formation of a quark-gluon plasma in heavy-ion collisions [1]. Investigating the modification of the intra-jet properties as a function of event multiplicity in pp collisions can provide deeper insight into the nature of these effects. We will present the recent measurements of...
A search for the electroweak production of a vector boson scattering using a WV (V=W/Z) pair with two jets is reported, where W decays leptonically while the other boson (V) decays hadronically, resulting in a semi-leptonic final state. The data correspond to an integrated luminosity of 138 fb$^{-1}$ of the proton-proton collision produced at the center of mass energy of 13 TeV collected by...
Heavy quarks (charm and beauty) have masses much larger than the characteristic energy scale of QCD interaction. Due to this they are typically produced in hard scattering processes with large $\{Q}^2$ and thus offer a unique perspective to study the transition from quark to hadrons in all collision systems. Recent production measurements of charm baryons and mesons in small system at...
The couplings of the Higgs boson (H) with massive gauge bosons of weak interaction (V = W, Z), can be probed in single Higgs boson production at the proposed future Large Hadron-Electron Collider (LHeC). In this talk, I will be presenting the collider reach on the new physics parameters of the HVV couplings assessed through the azimuthal angle correlation between missing energy (electron) and...
Probing solar modulation of galactic cosmic rays in the interplanetary medium and terrestrial atmosphere with muon has recently gained appreciable importance. The muons have superior penetrating power, generated at an altitude higher than the thunderclouds. Thunderstorms drastically change the atmospheric electric field, which causes variation in muon count rate. At GRAPES-3, we are observing...
The non-thermally produced freeze-in dark matter is an attractive alternative to look beyond the weakly interacting massive particle (WIMP) paradigm. With the singlet-doublet dark matter model, a simple extension to the Standard Model (SM), we probe the light dark matter parameter space, assuming feeble couplings between SM particles and the dark matter candidate. We tried to show that in the...
The study of prompt direct photons, from Compton scattering and annihilation hard processes in hadronic collisions, can test perturbative quantum chromodynamics theory predictions. In pp collisions, they can be used to constrain parton distribution functions as they come directly from the parton-parton hard scatterings. The measurement of direct photon production is complicated due to the...
The deflection of cosmic rays (CRs) in the interstellar magnetic field results in an almost isotropic flux as observed on Earth. However, anisotropies of different angular scales have been predicted at the level of ~$10^{−4}−10^{−3}$. Small-scale anisotropic structures on angular scales of ≤ 60◦ have been predicted due to relative diffusion of CRs in the local turbulent magnetic fields, the...
The anomalous magnetic moment of muons has been a long-standing problem in SM. The current deviation of experimental value of the (g − 2) μ from the standard model prediction is exactly 4.2σ. Two Higgs Doublet Models can accommodate this discrepancy but such type of model naturally generate flavor changing neutral current(FCNC). To prevent this it was postulated that 2HDM without FCNC required...
The Standard Model effective field theory (SMEFT) is one of the preferred approaches for studying particle physics in the present scenario. The dimension-six SMEFT operators are the most relevant ones and have been studied in various works. The renormalization group evolution equations of these operators are available in the literature and facilitate examining the SMEFT on combined...
We consider a black hole with a stretched horizon as a toy model for a fuzzball microstate. The stretched horizon provides a cut-off, and therefore one can determine the normal (as opposed to quasi-normal) modes of a probe scalar in this geometry. For the BTZ black hole, we compute these as a function of the level $n$ and the angular quantum number $J$. Though conventional level repulsion is...
As a part of its R&D, the ICAL collaboration has built a small prototype module called mini-ICAL to study the detector performance, and engineering challenges in the construction of large-scale magnet,
and magnetic field measurement systems as well as to test the ICAL electronics in the presence of the magnetic field. This detector was also used to measure the charge-dependent muon flux and...
Electroweak Symmetry Breaking (EWSB) is known to produce a massive universe that we live in. However, it may also provide an important boundary for freeze-in or freeze-out of dark matter (DM) connected to the Standard Model via the Higgs portal as processes contributing to DM relic differ across the boundary. We explore such possibilities in a two-component DM framework, where a massive...
We analyze in a model-independent way the potential to probe new physics using Higgs decay to ϒγ. The h→ϒγ decay width is unusually small in the Standard Model because of an accidental cancellation among the direct and indirect decay diagrams. Thus, any new physics that can modify the direct or the indirect decay amplitudes disrupts the accidental Standard Model cancellation and can...
There is serious disagreement between the predictions of Non-Relativistic Quantum Chromodynamics (NRQCD) and the data on $J/\psi$ polarisation which has persisted for almost a quarter of a century. We find that if we account for the effect of perturbative soft gluons on the intermediate charm-anticharm octet states in NRQCD then the polarisation problem can be resolved. In addition, this...
We study a strongly coupled lattice model containing two flavors of massless staggered fermions interacting via two types of interactions: (1) a current- current interaction involving a four-fermi term of the same flavour, and (2) an on-site four-fermion interaction involving two flavours. We study the model at strong coupling, where both these interactions dominated over the free hoping term....
We report on the results of new physics searches in a final state containing a photon and missing transverse energy called “monophoton searches” in a p-p collision at √s =13TeV. The data correspond to an integrated luminosity of 138fb$^-$$^1$. In the Standard Model, the only process that results in the genuine signature of a single photon and large MET is Z + γ production, in which the Z boson...
We present the results of a search for a pseudoscalar higgs boson (A), where A decays to a Z boson and a Standard Model like higgs boson (h), using pp collision data collected by the CMS experiment during LHC Run-2 at centre-of-mass energy of 13 TeV. Such a pseudoscalar higgs boson can be produced and decay in various beyond SM models, such as 2HDM and MSSM etc. In the final states, we...
The production of charmonium and its suppression in heavy-ion collisions is an ideal probe to explore the Quark-Gluon Plasma (QGP) in the laboratory. Suppression can also take place in hadron-nucleus collisions due to cold nuclear matter (CNM). The hadron-nucleus collisions are therefore important as they help disentangling the effects of the QGP from those due to CNM. The Charmonium...
Multiwavelength observations of Supernovae (SNe) have revealed the presence of dense Circumstellar Material (CSM) around their progenitor stars. This CSM is formed due to heavy mass loss that the progenitor stars suffer a few years prior to their death as SNe. High energy protons accelerated in SN explosion interacting with this CSM can produce secondary particles like high energy neutrinos...
In this work we study a viable dark matter (DM) mass region in a non-supersymmetric $SO(10)$ GUT scalar dark matter model. The model comprises of a scalar singlet $S$ and an inert doublet $\phi$ which are odd under a discrete $Z_2$ matter parity $(-1)^{(B-L)}$. The DM is a mixture of $Z_2$ - odd scalar singlet $S$ and neutral component of doublet $\phi$ belonging to a new scalar 16...
Present work investigates the properties of a proto-quark star (PQS) using Polyakov Chiral $\text{SU(3)}$ Quark Mean Field (PCQMF) model in the presence of a strong magnetic field. Considering various snapshots of PQS along the star evolution, the analysis of longitudinal and transverse equation of state (EoS) is carried out. Also, the effect of vector interaction on magnetized PQS with the...
The critical behavior of the two-dimensional XY model has been explored in the literature using various methods. They include the high-temperature expansion (HTE) method, Monte Carlo (MC) approach, strong coupling expansion method, and tensor network (TN) methods. This model undergoes a Berezinskii-Kosterlitz-Thouless (BKT) type of phase transition. This model can be modified by adding...
We demonstrate high prediction accuracy of three important properties that determine the initial geometry of the heavy-ion collision (HIC) experiments by using supervised machine learning (ML) methods. These properties are the impact parameter, the eccentricity, and the participant eccentricity. Although ML techniques have been used previously to determine the impact parameter of these...
We study the Standard model (SM) Higgs production in association with a Z-boson at the LHC. The leading contribution comes from $q\bar{q}$-initiated (DY-like) subprocess. In addition to this, the gluon fusion subprocess via fermion loops also contributes to this process at higher orders in QCD. In this work, we study the impact of higher-order QCD corrections and provide precise results for...
The results of a search for Higgs boson pair (HH) production in the 4W, 2W2tau, and 4tau decay modes are presented. The search uses 138 /fb of proton-proton collision data recorded by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV from 2016 to 2018. Analyzed events contain two, three, or four reconstructed leptons, including electrons, muons, and hadronically decaying tau...
In this talk I review the most important developments in string theory research over the last decade or so.
A Higgs boson was discovered by the ATLAS and CMS experiments at the LHC in 2012. Since then, the LHC experiments have made significant progress in precision studies with the data recorded during LHC Run-1+2 to establish the nature of the observed scalar particle as well as to look for indirect evidence for physics beyond the Standard Model. The latest LHC results from precision studies of the...
Over the past two decades, it has been increasingly clear that cosmological observations are homing on to a concordance ‘standard' model
of Cosmology model with increasingly precise determination of cosmological parameters. The observations of cosmic microwave background (CMB), most recently, the exquisite ESA Planck measurements have not only spearheaded this transition, but also allow ...
In this talk, I will discuss the technical challenges in analytic computations of multi-loop integrals that appear in higher-order perturbative computations. I will explain the techniques for computing integrals with massive internal propagators needed for two-loop QCD corrections for Higgs decays and NNLO QCD corrections for ttj production. The inclusion of massive internal propagators often...
Instrumenting a gigaton of ice at the South Pole, the IceCube Neutrino Observatory can probe neutrino interactions and properties at high energies with large statistics. This is possible due to the existence of a flux of high-energy astrophysical neutrinos, discovered by IceCube in 2013-14, and the prevalence of neutrinos produced in cosmic ray interactions in the upper atmosphere. Recently,...
Abstract: The primary ingredient for studying the phases of a quantum field theory is the effective action. Though obtaining an exact form is beyond the scope of the existing techniques, approximate expressions using perturbative methods which to the leading order involve computation of one-loop determinants are available. In the talk which is based on our paper [1], I will first describe...
The success of the LHC project is marked by not only the discovery of the Higgs boson a decade back, but also by the vast amount of knowledge acquired about the relevant physics. This talk will mainly highlight the major results on characterization of the Higgs boson based on the data from Run2 operation of the LHC.
A charged falling particle in an AdS space is studied as a holographic model of local charged quench. The evolution of holographic complexity in the conformal field theory following a local quench is studied using both the “complexity equals volume” (CV) and the “complexity equals action” (CA) conjectures in various models. The connection between operator size in chaotic theories and the bulk...
Several extensions of the standard model (SM) predict the existence of heavy particles that undergo lepton flavor violating (LFV) decays, thereby motivating searches to look for deviations from the SM in the dilepton final states. This talk will present the recent results on the search for such heavy resonances and quantum black holes in the eμ, eτ, and μτ mass spectra using the proton-proton...
The distribution amplitudes (DAs) for a heavy quark system are not known well and are very challenging. One tries to model them using heavy quark effective field theory. However, there is a free parameter involved which is related to the inverse moments of DAs. Its value needs to be fixed using some experimental data. For the case of B-meson, it is done using the information on the $B \to...
Currently, the most important mandate of the LHC physics programme is to measure the self-coupling
($\lambda$) of the Higgs boson. This parameter is crucial for describing the shape of the Higgs potential.
At the LHC pair production of the Higgs boson provides direct access to $\lambda$, though the event rate
is extremely small in the standard model. However, contributions from new...
The proton spin crisis is a long-term issue in spin physics, implying that the quark only carries a fraction of the proton's spin.
To compensate for the proton's spin, the spin sum rules are given.
These rules state that in a longitudinally polarized proton, the spin carried by the quarks and gluons, as well as their orbital angular momentum (OAM), must add to the proton spin.
This...
String theory lives in higher dimensions, and compactification of extra dimensions leads to many equivalent 4-d effective theories which potentially describe our universe. Hence, it is interesting to study this large set of 4-d models and their phenomenology in a statistical setup.
We focus on the statistical aspects of the type-IIB string landscape. We show that stabilization of kähler...
Singular factors originating from the QCD factorisation of scattering amplitudes in soft and collinear limits play a prominent role in both organising and computing high-order perturbative contributions to hard-scattering cross sections. In this talk, I will report on recent work with eprint number 2208.05840. We start from the factorisation structure of scattering amplitudes in the collinear...
We apply the physically more appealing MIT Bag boundary conditions to study the Casimir effect on the lattice. Employing known formalism to calculate the Casimir energy for free lattice fermions, we show that the results for the naive, Wilson and overlap fermions match the continuum expressions precisely in the zero lattice spacing limit, as expected from universality. Furthermore, the...
An overview of the search for top quark associated Higgs boson production (ttH and tH) using full Run-2 proton-proton collision data (137 fb-1) collected by the CMS experiment at center-of-mass energy of 13 TeV will be presented. This will cover Higgs decays into final states involving pairs of photons as well as final states involving leptons (electrons, muons and taus). This search is...
Measurements of fiducial inclusive and differential cross sections of Higgs boson production in p-p collisions are presented based on the data collected with the CMS detector, corresponding to an integrated luminosity of 137 $fb^{-1}$ at a centre-of-mass energy of 13 TeV. The final state is considered where the Higgs boson decays to two W bosons, which subsequently decay to an electron, a...
One of the classic ways of studying QCD events in high energy experiments is to measure the Event Shape variables e.g., Thrust, Jet Broadening, Angularity etc. which are observables designed to characterize several properties including the geometric shape of hadron distribution in the event. In this talk, we will discuss a more general global event shape "angularity" for deep inelastic...
In gauge theories and gravity, the scattering amplitudes of any number of external particles under the soft limit reduce to amplitudes with one less number of external particles times a universal soft factor. Higher-order interaction vertices (or scattering amplitudes) in a theory can be built up from the lower-order vertices (amplitudes) by using a multiplicative universal factor associated...
Feynman integrals at any order of perturbation, in the Lee-Pomeransky representation, could be realised as a subset of Euler-Mellin integrals. Such integrals are known to satisfy the Gelfand-Kapranov-Zelevinsky (GKZ) system of partial differential equations. In an ongoing collaboration, we automate the derivation of the associated GKZ-system for a given Feynman diagram from either its...
Despite an extensive set of searches for physics beyond the standard model, no smoking-gun evidence of resonant phenomena is observed so far at the LHC. Nevertheless, the recent application of effective field theories (EFT) demonstrates that subtle deviations, hiding in the observables' distributions, can probe new physics at energy scales often exceeding the LHC's reach in the direct...
Decays mediated by the flavour-changing neutral current transition $b\to s\ell^{+}\ell^{-}$ are not allowed at tree level in the standard model (SM) and can only proceed via higher-order loop diagrams. Such suppressed decays provide an excellent avenue to search for physics beyond the SM. The $B\to K\ell^{+}\ell^{-}$ ($ell = e, \mu$) decays have recently sparked a lot of interest in a...
We study the possibility of generating light Dirac neutrino mass from a radiative seesaw mechanism with dark sector particles going inside the loop, known as the scotogenic framework. The loop suppression and additional free parameters allow large ($\sim\mathcal{O}(1))$ coupling of light Dirac neutrinos with the dark sector particles. Such large Yukawa coupling not only dictates the relic...
In this talk, I discuss the calculation of all helicity amplitudes for four-parton scattering in three-loop massless QCD. Our results allow us, for the first time, to verify completely the structure of quadrupole IR divergences at this perturbative order in QCD. From the high-energy limit of the amplitudes, we have extracted the three-loop gluon Regge trajectory in full QCD. Our findings...
A good angular is essential for detecting gamma ray sources at multi-TeV energies. The GRAPES-3 experiment, located in Ooty, Tamil Nadu (11.4$^\circ$ N, 76.7$^\circ$ E, 2200 m a.s.l.), is designed with a dense array of 400 scintillator detectors spread over 25000 m$^2$ to study gamma rays sources in the TeV-PeV energy range. By exploiting the shower front curvature, almost a factor of two...
We measure the strong-phase difference between $D^{0}$ and $\bar{D_{0}}\to K_{S}^{0}K^{+}K^{-}$ using a data sample corresponding to an integrated luminosity of 2.92 ${\rm fb}^{-1}$ collected in $e^{+}e^{-}$ collisions at a centre-of-mass energy corresponding to the mass of the $\psi(3770)$. The D0-D0bar meson pairs produced are in a quantum-correlated state, their subsequent...
Keywords: Hubble tension, inflation, quantum gravity, effective field theory.
Recent observations from CMB, Planck and supernovae measurements show a discrepancy in the present estimated value of the Hubble parameter, known as the Hubble tension. In the present work, we seek the possibility of addressing the Hubble tension in the inflationary scenario with quantum gravity effect in the...
Deep learning (DL) is one of the most popular machine learning frameworks in the high-energy physics community and has been applied to solve numerous problems for decades. The ability of the DL models to learn unique patterns and correlations from data to map highly complex non-linear functions is a matter of interest. Such features of the DL model could be used to explore the hidden physics...
Motivated by the recent flavor anomalies we consider the extension of the Standard Model with a scalar leptoquark $S_1(\bar{3},1,1/3)$ and a scalar triplet to investigate the rare semileptonic $B$ decays involving quark level transitions $b\rightarrow c\ell^{-}\bar{\nu_{\ell}}$, $(g-2)_{\mu}$ anomaly, neutrino mass and matter-antimatter asymmetry simultaneously. The important feature of the...
Measurement of neutrino mixing parameters using a magnetized iron calorimeter (ICAL) is the primary goal of INO. Most of INO-ICAL related analysis, using prototype detector data and simulations, are currently based on conventional algorithms. In the recent years, AI-based analysis have shown impressive performance in many high-energy physics experiments. In this talk, we present an overview of...
This talk will discuss the semi-leptonic and non-leptonic $B_c$ meson decay into S-wave charmonium and present our results. This analysis has been done in the non-relativistic QCD(NRQCD) framework. We used Heavy-Quark Spin Symmetry (HQSS) to relate the $B_c\to \eta_c$ to the $B_c \to J/\psi$ form factors. Furthermore, the information on $B_c\to \eta_c$ form factors were extracted from...
The ultimate purpose of the relativistic heavy-ion physics is to study strongly interacting matter under the extreme conditions of high temperature and energy density respectively, where the quantum chromo-dynamics (QCD), the theory of strong interactions within the Standard Model, predicts a transition to a new phase of matter, the quark-gluon plasma, QGP. The QGP, a novel state of matter is...
Cosmic muon flux and its angular distribution have been measured using Resistive Plate Chamber(RPC) at Kolkata (22° 36' 6.71" N, 88° 25' 7.89" E) at 8 m elevation. Zenith angle was varied upto 90 degree in clockwise and 90 degree in anticlockwise direction with respect to zenith direction. The similar scenario was also simulated using cosmic flux following cosnθ distribution. Experiment and...
MINERvA is a dedicated (anti)neutrino experiment performed using $(\bar\nu_\mu)\nu_\mu$ beam with different nuclear targets and the aim is to study neutrino interactions and nuclear medium effects in the wide range of Bjorken $x$ and four momentum transfer squared $Q^2$. The study would not only be helpful in understanding the hadron dynamics in the nuclear medium but also it will be useful in...
The finite modular groups are isomorphic to permutation groups e.g. $\Gamma_{3}\simeq$ A$_4$. Apart from usual irreducible representations of the permutation groups, they have modular weights as new symmetry charges. The Yukawa couplings transforms as modular forms of complex modulus $\tau$ acquiring suitable charges of the underlying symmetry. In this work, we propose a scenario implementing...
The Level-1(L1) trigger is the first of the two-level trigger system of the CMS detector and is hardware based. It gathers information from the Electromagnetic(ECAL) and Hadron(HCAL) Calorimeters and muon detectors to select interesting physics events. The L1 Electron/Photon (e/γ) trigger identifies e/γ candidates based on energy deposition in the ECAL and HCAL. The present data taking period...
The characterization of sensor is being done in the set up at IIT Madras that includes laser source. The electrical measurements are performed on several silicon pad detectors, the results have been found to be in good agreement with the set up at CERN. First results are reported including the physical verification of the sensors using profilometer, manual probe station, confocal microscope...
The CMS Collaboration is preparing to replace its endcap calorimeters for the HL-LHC era with a high-granularity calorimeter (HGCAL). The HGCAL will have fine segmentation in both the transverse and longitudinal directions, and will be the first such calorimeter specifically optimized for particle-flow reconstruction to operate at a colliding-beam experiment. The proposed design uses silicon...
We consider a unified framework accommodating the dark matter and the matter-antimatter asymmetry of the universe, through a minimal addition of right-handed neutrinos and a singlet scalar φ to the Standard Model. The framework assumes an asymmetry in the dark sector and connects it with the asymmetry in the visible sector. It turns out that the out-of-equilibrium decay of heavier right-handed...
The INO's ICAL experiment will be instrumented with glass Resistive Plates Chambers (RPCs) as the active detector element. The mini-ICAL (Mini Iron CALorimeter) is a 600-times scaled-down version of the ICAL. It is currently in operation at a transit campus of INO in Madurai, mainly to study the engineering aspects of the ambitious ICAL detector. The mini-ICAL employs a Closed Loop gas System...
Current Status and Future Outlook of Neutrinoless Double Beta Decay Searches
Lisha*1, Neelu Mahajan1
1Department of Physics, Goswami Ganesh Dutta Sanatan Dharma College, Chandigarh, India-160031
corresponding author: neelu.mahajan@ggdsd.ac.in
In the last two decades, the search for understanding the nature of neutrinos and the origin of mass is one of the topics of paramount...
Many physics analyses at collider experiments are performed with photon as one of the final state particles, if not the only final state object. Identification of photons coming from hard scattering (prompt photons) in proton-proton collisions thus plays a crucial role. A major background comes from photons produced from π0-decays and fragmentation processes in jets. In order to identify the...
Higgs couplings to charged leptons form an important measurement to understand not only the Standard Model but also physics beyond Standard Models including, multihiggs models, supersymmetric models etc. In the present work, We focus on the complementarity between the direct and indirect measurements in fixing the charged Lepton Yukawa couplings including flavour violating couplings. We show...
Resistive plate chambers (RPC) are parallel plate gaseous detectors, made with relatively low cost materials, robust in fabrication and handling, and offer excellent time and position resolutions (up to 50 ps and tens of micrometers, respectively). RPCs have been used for muon identification in high energy physics experiments, including collider physics experiments, neutrino physics...
In the present work we have investigated the properties of the heavy quarkonia in the presence of finite baryonic chemical potential and momentum anisotropy by using the quasi-particle approach. The effect of the finite baryonic chemical potential has been incorporated through the quasi-particle Debye mass, and momentum anisotropy is used to examine the binding energies of the quarkonium...
We determine the properties of 1P state of the charmonia and bottomonia in the presence of strong magnetic field. Here we have employed the medium modified form of the potential which has both columbic as well as string part. This enables us to study the properties of the heavy quarkonia even above the critical temperatures. The magnetic field effect has been incorporated through the...
We apply the renormalization group procedure for effective particles (RGPEP) for a single flavor quark to obtain an effective Hamiltonian in light-front QCD for heavy quarkonia. We introduce gluon mass ansatz that leads to truncation up to the quark-anti-quark gluon sector. Using the renormalized Hamiltonian and appropriate Fock state basis we formulate the eigenvalue problem for quarkonium.
A rotating neutron star with hyperonic core described by an effective chiral model with $\sigma-\rho$ cross coupling within mean field approximation is considered. The hyperonic bulk viscosity coefficient caused by non-leptonic weak interactions is calculated and its role in suppressing the gravitationally driven $r$-modes is investigated. Various other relevant damping timescales are...
Strange hadrons have smaller interaction cross-sections compared to light hadrons. The freeze-out temperatures of strange hadrons are close to the quark-hadron transition temperature as predicted by lattice Quantum Chromodynamics (lQCD). Therefore, they serve as an excellent probe for understanding the dynamics of QCD matter and the onset of the partonic stage in relativistic heavy-ion...
We continue the study of a recently constructed holographic QCD model supplemented with magnetic field. We consider the holographic dual of a quark, anti-quark pair and investigate its entropy beyond the deconfinement phase transition in terms of interquark distance, temperature and magnetic field. We obtain a clear magnetic field dependence in the strongly decreasing entropy near...
Initial energy density produced in ultrarelativistic hadronic and heavy-ion collisions is an important quantity for characterisation of the system created in these collisions. In this work the Bjorken initial energy density is estimated in proton-proton collisions at $\sqrt{s} = 5.02, 7$ and 13 TeV for both minimum bias and different multiplicity classes with a new method using experimental...
Over the last few decades, there has been extensive research going on on a
few of the most sophisticated experimental setups which have ever been established in human history. Large Hadron Collider(LHC) at CERN and Relativistic
Heavy Ion Collider(RHIC), located at Brookhaven National Laboratory(BNL),
in New York, two serves as the benchmark to study the primordial form
of matter that...
We revisit an alternate gauge theoretic formulation leading to emergent gravity scenarios with renewed interest. The generic perspective of bulk/boundary correspondence is exploited to ensure the boundary aspects of quantum gravity from a bulk gauge theory. In addition to the extremal multi-black holes, we show that the non-extremal a charged black hole is also governed by multi-black holes in...
In this work, we focus on how to find out the exact solutions of a time dependent model of a damped harmonic oscillator affected by an external time varying magnetic field with a time dependent noncommutativity. The well known method of Lewis invariant associated with a non-linear differential equation, known as Ermakov-Pinney (EP) equation in literature, is chosen to treat the system. Then it...
Ever since their inception by Pauli, neutrinos have turned out to be one of the most fascinating particles. Despite decades of theoretical and experimental advances, many questions still remain unanswered in neutrino physics. Some of the most significant ones amongst these include the nature of neutrinos being Dirac or Majorana and the possibility of CP violation in the leptonic sector. In...
Quark gluon plasma (QGP) is a thermalized color deconfined QCD matter created at extreme conditions such as very high temperature and/or density in ultra relativistic heavy-ion collisions. The formation of QGP has been confirmed at the LHC and RHIC experiments by comparison of low momentum ($p_\perp$) measurements with relativistic hydrodynamic predictions, and, by comparison of high $p_\perp$...
We investigate the flavour bounds on the Z2×Z5 symmetry, a minimal form of the Z2×ZN flavour symmetry, that can provide a simple set-up for the Froggatt-Nielsen mechanism. This minimal form is capable of explaining the fermionic masses and mixing pattern of the standard model including that of the neutrinos. The bounds on the parameter space of the flavon field of the Z2×Z5 symmetry are...
The GRAPES-3 experiment contains several types of detectors namely plastic scintillators, proportional counters, and NaI(Tl) crystal detectors which are coupled with multiple independent data acquisition systems. At present, the GRAPES-3 operates 19 independent data acquisition (DAQ) systems. Multiple type detectors record different secondary components in the cosmic ray shower to study...
In mathematical physics, geometric quantization is a method of defining quantum theory corresponding to an existing classical theory. It has been successfully applied to many field theoretic models. Also, Constrained systems occur frequently in physics, since they typically arise in the Hamiltonian formulation of classical systems with gauge symmetries. Here, we will try to understand the...
In this work, we explore an alternative derivation of Hawking radiation. Instead of the field-theoretic derivation, we have suggested a simpler calculation based on quantum mechanical reflection from a one-dimensional potential. The reflection coefficient shows an exponential fall in energy which, in comparison with the Boltzmann probability distribution, yields a temperature. The temperature...
The LHC physics program achieved a huge physics goal by discovering the most anticipated particle, the Higgs boson, at 2012. Although the Higgs mass was found to be 125 Gev, there are physics models predicting heavy Higgs bosons. In LHC Run 1 analysis, It has already been found that there is no standard model like heavy Higgs boson within the mass range between 200 GeV and 1000 GeV. With an...
Black hole horizons admit a set of degrees of freedom which may be thought to be induced from the spacetime bulk. Such a formulation, in which the quantum dynamics of horizon may be understood in terms of these horizon data, may be developed in a covariant framework. We shall describe how this method may be used to identify the thermodynamic properties of a horizon.
Quantum Chromodynamics (QCD) predicts that at sufficiently high temperature ($T$) and/or baryon chemical potential ($\mu_{B}$), the state of matter is in the form of quarks and gluons, which are no longer confined withins hadrons. This deconfined state of matter is known as the Quark-Gluon Plasma (QGP). The goal of relativistic heavy-ion collision experiments is to create such a hot and dense...
We have revisited Chandrasekhar limit calculation for zero magnetic field case and explored its finite magnetic field extension. We have considered the quantum aspect of magnetic field for which the perpendicular momentum components (with respect to the direction of magnetic field) are quantized. Due to magnetic field, an anisotropic nature in thermodynamic quantities like pressure is...
The recent measurements on $R_D$, $R_{D^*}$ and $R_{J/\psi}$ by BaBar, Belle and LHCb experiments, which deviate substantially from their Standard Model predictions indicate that the notion of lepton flavour universality (LFU) is violated in the weak charged-current processes, mediated through $b \to c \ell \bar \nu_\ell$ transitions. These intriguing results hint towards the possible...
CMS detector at CERN-LHC has a two level trigger system to filter events that are stored for further analysis. The Level-1 trigger is based on fast electronics. The events passing the Level-1 trigger have to then go through the High Level Trigger (HLT), which is based on a computing farm. The HLT menu consists of a large number of HLT paths based on various selections on reconstructed physics...
We will describe the search for exotic decays of Higgs boson to a pair of light pseudoscalar Higgs bosons under the hypothesis that one of the pseudoscalars decays to a pair of b quarks and the other decays to two photons. Such signatures are predicted in Beyond Standard Model (BSM) physics, namely next-to-minimal supersymmetric standard model. The final state consisting a pair of b jets and...
The motion of cosmic strings in the universe leads to the generation of wakes behind them. We study magnetized wakes of cosmic strings moving in the post recombination plasma. We show that magnetic reconnection can occur in the post-shock region of the cosmic string wake. This leads to a large amount of kinetic energy being released in the post-shock region of the wake. Since the width of the...
The work is used to understand the behaviour of thermodynamic properties of hot and dense system quark gluon plasma (QGP) in the presence of static and dynamic magnetic field. The theoretical and experimental results indicated that a strong magnetic field produce at RHIC and LHC during the collisions of heavy ions. We compute the equation of states (EoS) of QGP with static and dynamic magnetic...
Jets are collimated sprays of particles produced from the fragmentation and hadronization of hard-scattered partons in high energy hadronic and nuclear collisions. Jet properties are sensitive to details of parton showering processes and are expected to be modified in the presence of a dense partonic medium. Measurement of intra-jet properties in p--Pb collisions will help to investigate cold...
The proposed ICAL detector by the INO Collaboration is a 51 kTon magnetized Iron Calorimeter which is designed to detect muons of energy in the range of 1-25 GeV, which are generated by the interaction of atmospheric $\nu_{\mu}$ and $\bar{\nu}_{\mu}$ with the iron. ICAL is designed to provide a maximum magnetic field of $\sim$ 1.5 Tesla with 90$\%$ of its volume having more than 1 Tesla field....
Effective cross-section defines the matter overlap in a two-particle collision and is considered one of the important tools to study proton-proton collisions at high energies. In a conventional approach, the value of effective cross-section is estimated by fitting the observables sensitive to double parton scattering. In this paper, the value of effective cross-section is predicted using the...
The decay of any higher $c\bar{s}$ meson to $D_{s}^{+}\pi^{0}$ violates isospin conservation, thus small partial width. Some theoretical models suggest $D_{s}^{*+} \to D_{s}^{+}\pi^{0}$ proceed via $\pi^{0} - \eta$ mixing to conserve isospin but including such consideration also, the radiative decay $D_{s}^{*+} \to D_{s}^{+}\gamma$ is still expected to dominate. The Belle II...
One of the manifestations of strong jet-energy loss in heavy-ion collisions is the large energy or $p_{\rm T}$ imbalance of jet-pairs that are produced back-to-back. It is generally argued that this asymmetry is caused by the difference in the path-length traversed by the jets in the medium. We utilize this magnitude of momentum imbalance ($x_j$) as a parameter to study the path-length effect...
A minimal extension of the standard model giving rise to baryogenesis is studied. This model includes the interaction of heavy color-triplet scalars (~TeV) with a light Majorana fermion (~GeV) which is a potential non-thermal dark matter (DM) candidate and an up-type quark. The color-triplet scalars would be produced via the fusion of two down-type quarks ( d and d'). We investigate the case...
One of the essential ingredients for the precise measurement of neutrino oscillation parameters is the precise knowledge of neutrino energy. Due to heavy nuclear targets, nuclear effects introduce complications that create systematic uncertainties in neutrino energy reconstruction. These uncertainties further influence the determination of neutrino oscillation parameters. In this work, we...
We explore the next-to-minimal supersymmetric Standard Model (NMSSM) using Higgs information at the LHC. The preferred values of various sparticle masses will also be discussed along with the associated NMSSM parameters found through a detailed scan consistent with experimental and dark matter constraints.
We apply the BFFT formalism to a prototypical second-class system, aiming to convert its constraints from second to first-class. The proposed system admits a consistent initial set of second-class constraints and an open potential function providing room for applications to mechanical models as well as field theory such as the non-linear sigma model. The constraints can be arbitralily...
As a part of its R\&D, the ICAL collaboration has built a small prototype module called mini-
ICAL to study the detector performance, engineering challenges in the construction of large-scale magnet,
magnetic field measurement system as well as to test the ICAL electronics in the presence of the magnetic field. This
detector was also used to measure the charge-dependent muon flux as well as...
The extension of the standard model with heavy right-handed neutrinos simultaneously accounts for the light neutrino mass and baryon asymmetry through leptogenesis. In addition to the properties of the heavy neutrinos, leptogenesis exhibits dependence on the CP phases measurable at neutrino oscillation and neutrinoless double beta decay experiments. In this work, we examine the scenario where...
We explore the possibility of Euclidean wormhole to black hole phase transition in the context of JT gravity at finite charge density. The low temperature phase of the system indicates the charged wormhole solution which is dual to the two-site uncoupled complex SYK model at finite charge density. On increasing the temperature of the system, the wormhole phase undergoes a first order phase...
Recent image of the M87* and Sgr A* black hole by EHT collaboration has opened a new portal to unlock various mysteries of the universe. Due to extreme gravity around a black hole, there will be an enhanced distribution of dark matter, which will have a significant effect on the image of the black hole. One certain feature of a black hole image is the black hole shadow, which can be used...
The first observation of an exclusive $b\to s\gamma$ process was made by CLEO in 1993 in the $B \to K^{*}(892) \gamma$ decay. Since then, the decay has been one of the most extensively studied radiative penguin processes. The decay of the $B$ meson to the $K^{*}(892)\gamma$ final state is forbidden at tree level in the standard model (SM), which primarily occurs via a one-loop $b\to s\gamma$...
We propose a scenario where a high scale seesaw origin of light neutrino mass and gravitational dark matter (DM) in MeV-TeV ballpark originating from primordial black hole (PBH) evaporation can be simultaneously probed by future observations of stochastic gravitational wave (GW) background with multiple tilts or spectral breaks. A high scale breaking of an Abelian gauge symmetry ensures the...
The universe is believed to be originated from a quantum state. However, defining measurable quantities for the quantum properties in the present universe has gained interest recently. In this work, we propose a quantum Poincare sphere as an observable quantity that can hint at the quantumness of primordial gravitational waves and large-scale magnetic fields. The Poincare sphere is defined in...
Non-standard neutrino interactions with a massive boson can produce the bosons in the core of core-collapse supernovae (SNe). After the emission of the bosons from the SN core, their sub- sequent decays into neutrinos can modify the SN neutrino flux. We show future observations of neutrinos from a next galactic SN in Super-Kamiokande (SK) and Hyper-Kamiokande (HK) can probe flavor-universal...
Extreme conditions of energy density and temperature are the prerequisites to produce a deconfined state of quarks and gluons in ultra-relativistic heavy-ion collisions. The initial state geometry of the created system gives rise to spatial anisotropy, which later results in the momentum anisotropy of the final state particles in non-central collisions. Anisotropic flow (especially elliptic...
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 the early to late time transition can be obtained from the status of the radiation entanglement wedge. In particular, we compute the time where the mutual...
The Higgs discovery in 2012 started a precision era in particle physics. Most future colliders aim for precision measurements in the Higgs sector to probe any signal of new physics. These precision measurements demand more accurate theoretical predictions of Higgs production and decay rates. In this direction, we compute the contribution of two-loop mixed QCD-Electroweak corrections at...
We investigate the renormalization group scale dependence of the $H \rightarrow gg$ decay rate at the order N$^4$LO in renormalization-group summed perturbative theory, which employs the summation of all renormalization-group accessible logarithms including the leading and subsequent four sub-leading logarithmic contributions to the full perturbative series expansion. The attractive...
A search for the production of a vector-like quark, T′ will be presented based on proton-proton collision events at √s = 13 TeV. The data sample corresponds to an integrated luminosity of $138~\rm{fb^{-1}}$, collected by the CMS during 2016-18 operations of the LHC. This search targets the electroweak production mechanism of T′ in the mass range 600 − 1200 GeV, in a narrow width approximation....
Quantum chromodynamics (QCD) is the theory of strong interaction between quarks mediated by gluons. QCD predicts that pairs or triplets of quark and antiquark can bind together, forming the hadrons. In QCD, the gluons interact not only with the quarks but also among themselves since they carry the color charge that characterizes the strong interaction. This fact allows Lattice QCD to predict...
We search for the decay of $B^0\rightarrow \gamma\gamma$ using 711$fb^{-1}$ of data collected at $\Upsilon$(4S) resonance by the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider located at High Energy Accelerator Research Organization (KEK), Japan. It is a Flavor Changing Neutral Current (FCNC) process which can be described by a penguin loop diagram in the leading order. The...
Recent measurements of B to charm semileptonic decays show a difference between the branching ratio of the sum of exclusive decay rates and the inclusive $b \rightarrow cℓν$ decay rate (the so-called Semi-Leptonic (SL) gap) which affects the interpretation of the CKM element |Vcb|. Large contributions from not-yet measured $B \rightarrow D(∗)ηℓν$ decays could be the explanation of such...
In the standard model, mixing and CP violation in the charm sector are expected to be very small and thus they constitute a sensitive probe for potential new physics contributions.
The "wrong-sign" D^{0}->K^{+}π^{−}π^{0} decay is one of the most promising channels at Belle II, as this can be produced through two interfering processes: a direct doubly Cabibbo-suppressed decay of the D^{0}...
Within Neutrino Physics, Seesaw mechanism is a very important pillar, known to all. Various Seesaw types make it an interesting phenomenon to include and verify it's validity in several low energy processes. Such a low energy and LNV ($\Delta L = 2$) process is the neutrinoless double beta decay ($0\nu\beta\beta$). If the $0\nu\beta\beta$ decay process is being observed in Left-right symmetric...
Extensive investigations on Pb+Pb and Au+Au collisions at the Large Hadron Collider (LHC) and Relativistic Heavy Ion Collider (RHIC) have helped us to produce and comprehend the properties of the quark-gluon plasma (QGP) in heavy-ion collisions. Recent investigations hint toward the possible formation of QGP-droplets in small collision systems such as high-multiplicity pp collisions....
We study the formation of shocks in the wakes of moving cosmic strings. The plasma considered is a magnetized plasma with a high beta value. We find that multiple shocks may form in the cosmic string wake. A detailed numerical study is carried out to study the structure of the shocks. We use a 2D-magnetohydrodynamic simulation to study the evolution of the magnetic fields in the shocks. The...
Moduli stabilization in type-IIB string theory is an intriguing problem to arrive at an effective description of 4d cosmological inflationary paradigm as reflected by the recent experiments. At tree level with fluxes, dilaton and complex structure moduli are stabilized [1] by suppersymmetric constraints leaving the Kahler moduli undetermined. In order to stabilize the latter, non-perturbative...
The spectral properties of strange quarkonium (ss ̅) is analysed using quark model approach. Present study also incorporates spin dependent interactions to obtain the hyperfine splitting of ss ̅. To compute these mass spectra of (ss ̅), we have solved Dirac equations with a Martin plus constant confinement mean field potential. The predicted masses of nS states of strange quarkonium are in...
Within the statistical model approach, we investigate the contributions of sea
quarks and gluon to the structure of pion. In this approach, hadrons assumed
to be an ensemble of quark-gluon Fock states. The principle of detailed balance
is used to calculate the probability of each Fock state in pions. Various sub-
processes like g ⇔ gg, g ⇔ q ̄q and q ⇔ qg are considered. We calculated...
Photon energy bias is used to compute the corrections to the reconstructed photon energy and improve data-simulation agreement in analyses having final states with photons.
In this study, we reconstruct clean samples of π^{0} → γγ decays from the D^{∗+} → D^{0}(→ K^{−}π^{+}π^{0})π^{+} decay chain in both simulation and data collected by Belle II. The Belle II is the upgraded experimental...
In recent years, several measurements of B-decays with flavor-changing neutral currents, i.e., $b \rightarrow d$ transitions, hint at deviations from the Standard Model (SM) predictions. The $B^{0} \rightarrow \gamma\gamma$ decays are forbidden at tree-level in the SM and can only proceed via suppressed loop level diagrams. Such decays are an ideal probe to search for phenomena beyond the SM...
The recent experimental measurements in the heavy flavour sector seem to indicate presence of physics beyond the standard model, though not conclusively. Though the measured branching ratio of $B^0_s \to \mu^+ \mu^-$ at the LHC experiments seem to be compatible with the standard model expectations within errors, it is imperative to search for other processes as a probe for new physics. We...
Here in this work we have carried out the study of traversable wormhole in $f(R)$ gravity with the function $f(R)=R+\alpha R^n$, where $\alpha$ and $n$ are arbitrary constants. The $f(R)$ gravity is a reputed alternative gravity theory in which the Ricci scalar $R$ in the Einstein-Hilbert gravitational Lagrangian is replaced by a general function of $R$. We have chosen the shape function of...
We develop an $A_4 \times Z_4 \times Z_2$ symmetry model of neutrino masses and mixings within the Minimal Extended Seesaw mechanism where three right-handed neutrinos $N_1$ , $N_2$ and $N_3$ and a keV-scale singlet sterile neutrino $S$ are added to the Standard Model. This model breaks $\mu-\tau$ symmetry of neutrino mass matrix and successfully explains leptonic mixing with non-zero...
The photonuclear reactions using deuterium targets find application in nuclear physics, laser physics and astrophysics. The studies related to deuteron photodisintegration using polarized photons has been the focus of interest since 1998 [1] which influenced many experimental studies that were carried out using 100 percent linearly polarized photons at Duke free electron Laser...
The two-particle correlations as a function of relative momenta of identified hadrons involving $\mathrm{K^{0}_{S}}$ and $\Lambda/\bar{\Lambda}$ are measured in PbPb collision at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV with the data samples collected by the CMS experiment at the LHC. Such correlations are sensitive to quantum statistics and possible final state interactions between the...
We propose a type II seesaw model for light Dirac neutrinos to provide an explanation for the recently reported anomaly in W boson mass by the CDF collaboration with $7\sigma$ statistical significance. In the minimal model, the required enhancement in W boson mass is obtained at tree level due to the vacuum expectation value of a real scalar triplet, which also plays a role in generating light...
We introduce a new model of relativistic quantum analogue of the classical Otto engine in the presence of a perfectly reflecting boundary. A single qubit acts as the working substance interacting with a massless quantum scalar field, with the boundary obeying the Dirichlet condition. The quantum vacuum serves as a thermal bath through the Unruh effect. We observe that the response function...
Recent advancement in Neutrino Oscillation study has reached the precision era and hence a highly precise measurement of $\theta_{23}$ mixing angle takes a prime role to address long-standing flavor problems by ruling out different theoretical mass models. Two highly promising future long-baseline experiments DUNE and T2HK can serve us to pin down the atmospheric neutrino oscillation...
Black holes are one of the most intriguing and puzzling objects in the universe. Computing the volume of a black hole is not as straightforward as defining the area of the enclosing horizon. In this article we define the volume using the technique developed by Christodoulou and Rovelli for Schwarzschild black holes and extend it to the case of a rotating black hole in 2+1 dimensions. We show...
We will describe the opportunities offered by long baseline oscillation experiments and highlight the role played by the near detector as well as the far detectors. This discussion would mainly revolve around the upcoming Deep Underground Neutrino Experiment (DUNE). DUNE will detect neutrinos generated in the LBNF beamline at Fermilab, using a Near Detector (ND) situated near the beam target...
There are compelling theoretical arguments in favour of the existence of various baryon-rich exotic QCD phases in the core of a pulsar. However, proving such a hypothesis remains challenging due to the lack of a probe of the core. We suggested a technique of probing the phases by studying the effects of phase transition induced density inhomogeneities on pulse profile modulation. We initiated...
The ALICE experiment at the LHC is designed to study the hot and dense medium produced in ultrarelativistic heavy-ion collisions. Due to their short lifetimes, resonances are useful tools to understand the mechanism of particle production and properties of the hadronic phase created after these collisions. The yield of resonances might be modified with respect to expectations due to in-medium...
The Forward Calorimeter System (FCS) as well as the Forward Silicon Tracker (FST) is the most recent upgrade of the STAR detector at RHIC, BNL. This upgrade in the forward 2.5<η<4 rapidity region is mainly driven to explore QCD physics in the low region of x as those related to the nucleon spin structure. The FCS consists of the refurbished PHENIX Shashlyk Lead Scinitillator (Pb/Sc)...
As the densities in the interior of neutron stars exceed those of terrestrial nuclear experiments, they provide scope for studying the nature of dense matter under extreme conditions. The composition of the inner core of neutron stars is highly uncertain, and it is speculated that exotic forms of matter such as hyperons may appear there. Gravitational waves emitted by unstable oscillation...
The proposed new Electron-Ion collider poses a technical and intellectual challenge for the detector design to accommodate the long-term diverse physics goals envisaged by the program; one requires a 4𝝅 detector system capable of identifying and reconstructing the energy and momentum of final state particles with high precision. The EPIC collaboration has formed to design, build, and take data...
Hadronic resonances are effective tools for studying the hadronic phase in ultrarelativistic heavy-ion collisions. In fact, their lifetime is comparable to that of the hadronic phase, and resonances are sensitive to effects such as rescattering and regeneration processes, which might affect the resonance yields and shape of the transverse momentum spectra. These processes can be studied...
In this work, we have explored a highly motivated beyond the Standard Model scenario, namely, R-parity violating supersymmetry, in the context of light neutrino mass and mixing. The R-parity is broken by only the lepton number violating the bilinear term. We try to fit two non-zero neutrino mass square differences and three mixing angle values obtained from the global chi-square analysis of...
We consider an extension of Littlest Seesaw model with an additional scalar and a fermionic particle under the freeze-in scenario. Primordial black hole of a certain mass range can act as an alternate production mechanism for the dark matter particles as it evaporates via Hawking radiation. Furthermore, the presence of a primordial black hole with substantial energy density gives rise to...
The latest data of the two long-baseline accelerator experiments NOνA and T2K, interpreted in the standard 3-flavor scenario, display a discrepancy. A mismatch in the determination of the standard CP-phase $\delta_{\rm CP}$ extracted by the two experiments is evident in the normal neutrino mass ordering. While NOνA prefers values close to $\delta_{\rm CP} \sim 0.8\pi$, T2K identifies values of...
The short-lived resonances, like $K^{*0}$, are a good candidate to probe the hadronic phase of the matter formed in heavy-ion collisions. Due to its short lifetime, the decay daughters may interact with the hadronic medium, resulting in a change in the properties of the resonances. The decay daughters may undergo various in-medium effects like rescattering and re-generation. Hence $K^{*0}/K$ ...
The high granularity calorimeter (HGCAL) of CMS is planned to operate during the high luminosity operation of the LHC (year 2028 onwards), replacing the existing electromagnetic and hadronic calorimeters at the endcap. It will enable a detailed investigation of vector boson fusion processes and Lorentz-boosted topologies at forward rapidity. An extensive validation of the hardware and software...
The CMS and ATLAS experiments have made clear observations of a Standard Model (SM) Higgs boson candidate with a mass of 125 GeV. While its discovery has reaffirmed the SM, detailed measurements of its properties and searches for additional similar undiscovered particles are promising methods of discovering Beyond SM (BSM) physics. A search for the SM Higgs boson decaying to Z boson and a...
Dark matter (DM), if captured in considerable amount at the Solar core may undergo the process of self-annihilation producing standard model particles such as neutrinos, charged leptons, or gamma as the end product. Neutrinos, thus produced in the Solar core from DM annihilation may be detected at a terrestrial neutrino detector. KM3NeT is an under-sea neutrino detector at the Mediterranean...
Liquid argon time-projection chamber (LArTPC) detectors have unique and powerful properties for neutrino physics and beyond-the-standard-model (BSM) searches. A LArTPC provides precise digital readout of charged particle trajectories, enabling a detailed picture of the aftermath of neutrino and BSM particle interactions. We will discusses the opportunity to search for the Beyond Standard model...
Ultraperipheral lead-lead collisions produce very large photon fluxes that fundamental quantum-mechanical processes can be observed and well studied. The first measurement of $\tau$ lepton pair in ultraperipheral PbPb collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV with data collected by CMS during the LHC Run 2 will be presented. The study paves the way for the determination of the...
Various extensions of the standard model (SM) invoke the presence of more than one Higgs doublet in the SM Lagrangian. In particular, the two-Higgs doublet model assumes the presence of an additional $SU(2)_{L}$ complex doublet. We are looking for $H^{\pm}$ in the top-quark pair production process, where one top quark decays to a charged Higgs boson and a bottom quark, and the other to a $W$...
Global observables such as the pseudorapidity distributions of particle multiplicities in the final state are crucial to shed light into the physics processes involved in hadronic collisions. In proton-lead (p-Pb) collisions at LHC energies, such measurements provide an important baseline to understand lead-lead (Pb-Pb) results by disentangling hot nuclear matter effects from cold nuclear...
The inert Higgs-doublet model provides a simple framework to accommodate a viable Higgs portal scalar dark matter candidate, together with other heavier scalars of mass 100 GeV or more. We study the effect of next-to-leading order (NLO) QCD corrections in this scenario in the context of the Large Hadron Collider.
${\cal{O}}(\alpha_s)$ corrections to the gluon-gluon-Higgs effective coupling...
Existence of non-interacting fermion singlets, known as sterile neutrinos, are contextualised in beyond standard model physics. From accommodating oscillation anomalies to play a role of messenger for neutrino mass generation mechanism through type-I seesaw, they have blossomed as a key ingredient with their several mass variants. In addition, being a standard model singlet, they are...
We present an extension of the SM involving three triplet fermions, one triplet scalar and one singlet fermion, which can explain both neutrino masses and dark matter. One triplet of fermions and the singlet are odd under a $Z_2$ symmetry, thus the model features two possible dark matter candidates. The two remaining $Z_2$-even triplet fermions can reproduce the neutrino masses and...
The exercise of producing the "Mega Science Vision 2035" document for India, coordinated by the Office of the PSA, is in progress. The current status of the Nuclear Physics and High Energy Physics documents will be presented.
The past decade has seen the opening of two new windows to the Universe - high energy neutrinos and gravitational waves. Leveraging data from other astrophysical messengers, two extragalactic candidate sources have been identified for the high energy neutrinos - TXS 0506+056 and NGC 1068. The existence of this flux enables the testing of fundamental particle physics at energies far beyond the...
The GRAPES-3 experiment located in Ooty, Tamil Nadu is the major cosmic ray observation facility in India. It operates 24x7 with an array of 400 plastic scintillator detectors of 1 m$^2$ area each and a 560 m$^2$ area large muon telescope to sample the electromagnetic and muonic components of cosmic ray showers respectively. It allows us to study high energy phenomena from 10 TeV to 10 PeV...
This presentation will review recent advances in detectors by taking into account the needs for present and future experiments. It will discuss some selected directions of targeted detector development. It will also explore some interesting areas of blue sky research.
We consider a fermionic dark matter (DM) in the left-right symmetric framework by introducing a pair of vector-like (VL) doublets in the particle spectrum. The stability of the DM is ensured through an unbroken Z2 symmetry. We explore the parameter space of the model compatible with the observed relic density and direct and indirect detection cross sections. The presence of charged dark...
Topological defects are a natural consequence of several symmetry breaking phase transitions. In this talk I will concentrate on cosmic strings and give an overview of the search for signatures of cosmic strings using various methods. I will then describe how magnetic fields can be generated in the wakes of Abelian Higgs strings. The magnetic field generated in these wakes can open up a whole...
There have been several signatures of quark-gluon plasma (QGP) seen in the TeV proton+proton collisions at the Large Hadron Collider (LHC) energies, some of those include long-range ridge-like correlations, strangeness enhancement, comparable freeze-out temperature with a deconfinement transition temperature, etc.. Although so far it is inconclusive to conclude on the formation of QGP in TeV...
The establishment of non-zero neutrino masses by the phenomenon of neutrino oscillations provides a clear-cut indication of the existence of neutrino magnetic moments. We provide the neutrino magnetic moments in the presence of right-handed current effects within the Left-Right Symmetric Model (LRSM). The effects of Dirac and Majorana phases on the cancellation of the magnetic moments for...
We present a search for the lepton flavor violating decays $B_s \rightarrow \ell \tau$; $\ell = e, \mu$ using the full data sample of 121.4 fb$^{-1}$ of data recorded on $\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. We use $B_s\bar{B_s}$ events in which one $B_s$ meson is reconstructed in a semileptonic $B_s \rightarrow D_s \ell \nu$ decay...
Proton radiography is one of the promising techniques in proton therapy to reduce the range uncertainty that arises from the conversion of x-ray Hounsfield Units (HU) into relative stopping power (RSP) of protons. However, the quality of the obtained proton images is deteriorated due to the multiple Coulomb scattering (MCS) effects. There are various approaches proposed to improve the proton...
The ANTARES neutrino telescope and its next-generation offspring, KM3NeT, located in the abyss of the Mediterranean Sea, have been designed to study neutrinos from a variety of sources over a wide range of energies and baselines. One of the principal goals of these experiments is to determine Earth-matter effects stemming from the energy and zenith angle dependence of atmospheric neutrinos in...
We present the results of a search for new physics in events with a photon, an electron or muon, and large missing transverse energy (MET). The study is based on a sample of proton-proton collisions at $\sqrt{s} = 13$ TeV corresponding to an integrated luminosity of 137 $fb^{-1}$ collected with the CMS detector in 2016-2018. Many models of new physics predict events with jets and significant...
Study of particle showers produced in the atmosphere due to the interactions of primary cosmic particles have provided a natural laboratory of physics of standard model and beyond standard model. While the showers encompass the physics of strong, weak and and electromagnetic interactions, the very first interactions are strong interactions producing hadronic showers which introduce the...
In High Energy Experiments there is extensive use of Machine Learning and Deep Learning algorithms. These well-established algorithms extract complex features from the data and are used for event and particle identification, energy estimation, and pile-up suppression. We present the application of these tools in the domain of pituitary tumor identification in MRI and PET-CT scans. The...
We consider the propagation of gravitational waves in the late time Universe with the presence of structure. Before detection, gravitational waves emitted from distant sources have to traverse through regions of spacetime which are far from smooth and homogeneous. We investigate the effect of inhomogeneities on the observables associated with the gravitational
wave sources. In particular, we...
The extension of SM with inert doublet and right-handed neutrinos is being studied. The
inert doublet which is odd under Z_2 does not take part in the electroweak symmetry breaking
(EWSB) and thus provides a viable dark matter candidate. The light neutrino mass is generated by the seesaw mechanism. It is observed that vacuum stability is rescued by the addition
of scalars i.e. doublet and...
Neutrinos are fundamental yet ill-understood particles in the standard model. The fact that they oscillate among each other is an indication towards non-zero masses of neutrinos. This highlights the limitations of the Standard Model of particle physics, which predicts massless neutrinos. Recent measurements of non-zero reactor angle has also opened up an opportunity for a wide variety of...
Effective field theories (EFTs) provide us a powerful way of organising low-energy physics of interest in quantum field theories. The Physics of QCD at very low temperature and at very high temperature are well described by; respectively, theory of pions, and an effective weak coupling expansion. These EFTs usually depend on hierarchy of scales, and usually become ineffective when temperature...
We study a possible particle-antiparticle asymmetry in the dark matter (DM) sector via DM scatterings. We have studied two example scenarios in which we show a novel interplay between DM elastic and inelastic scatterings set the relic density and the composition of the DM sector in the present universe. The scenario can be realized in a $\mathcal{Z}_3$ symmetric effective theory with a...
We study neutrino oscillations in a rotating spacetime under the weak gravity limit for the trajectories of neutrinos which are constrained in the equatorial plane. Using the asymptotic form of the Kerr metric, we show that the rotation of the gravitational source non-trivially modifies the neutrino phase. We find that the oscillation probabilities deviate significantly from the corresponding...
Standard Model (SM) is a theory of fundamental particles and their interactions. Despite being a successful theory, SM is unable to offer explanation for the existence of Dark matter (DM), matter-antimatter asymmetry, hierarchy problem, neutrino masses etc. Many models beyond the SM have evolved over the time to explain these limitations. One such model is Supersymmetry (SUSY) which has been...
Electroweak Baryogenesis needs a Strong First-Order Electroweak Phase Transition as a pre-requisite to explain the observed Baryon asymmetry of the Universe. A strong first-order electroweak phase transition, single or multi-step, can be accommodated easily in supersymmetric models with singlet extensions. Confining ourselves in the context of the Next-to-Minimal Supersymmetric Standard Model...
NOvA is a two-detector, long-baseline neutrino oscillation experiment located at Fermilab, Batavia, IL, USA. It is primarily designed to constrain neutrino oscillation parameters using muon neutrino (anti-neutrino) disappearance data and electron neutrino (anti-neutrino) appearance data. NOvA detects neutrinos from Fermilab’s Neutrinos at Main Injector (NuMI) beamline. The unoscillated muon...
Axions-like-particles (ALP) naturally appear in many extensions of the Standard Model of particle physics, and are viable candidates to Cosmological Dark Matter. The Sun can also be an astrophysical source of ALP, produced through the Primakoff process. It can leave their signatures at detector through the inverse Primakoff (IP) scattering. We identify inelastic channels to the IP-processes...
We present here for the first time the impact-parameter dependent saturated dipole model (bSat or IP-Sat) with a fit [1] to the leading neutron structure function HERA data in one pion exchange approximation. We estimate the magnitude of gluon saturation effects by performing a fit to the same data with the linearised version of the considered dipole amplitude and comparing both models. Our...
In micropattern gas detectors, the Gas Electron Multiplier (GEM) is a proven amplification method for the position detection of ionising radiation, such as charged particles, photons, X-rays, and neutrons. GEM detectors have been used in high energy physics experiments due to their excellent spatial and time resolution, high-rate capabilities, and flexibility in design. The principle is based...
Event-by-event fluctuations of the mean transverse momentum, $\langle p_{\rm T}\rangle$, of charged particles produced in Pb-Pb and Xe-Xe collisions at $\sqrt{s_\rm{NN}}$ = 5.02 TeV and $\sqrt{s_\rm{NN}}$ =5.44 TeV, respectively, are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations are observed in both collision systems...
Standard model of cosmology (Λ-CDM model) mainly suffers from two drawbacks, first one is the fine tunning problem and second one is a cosmic-coincidence problem. In this standard model of cosmology, Λ represents the cosmological constant and CDM denotes the cold-dark matter. Another important downside of the Λ-CDM model from the observational perspective is the discrepancy between the present...
The strong statistical significance of an observed electron-like event excess in the MiniBooNE (MB) experiment, along with an earlier similar excess seen in the Liquid Scintillator Neutrino Detector (LSND), when interpreted in conjunction with recent MicroBooNE results may have brought us to the cusp of new physics discoveries. This has led to many attempts to understand these observations,...
After a decade of Higgs boson discovery by the ATLAS and the CMS experiment at the LHC, subsequent observation of ttH events, and study of Higgs decaying into a pairs of W(Z) boson and $\tau$ fermion, physics beyond the standard model still remains a puzzle. Vector-like quarks (VLQs) are hypothetical spin-1/2 particles of the fourth generation that have left and right-handed components...
Each High Energy Physics (HEP) experiment has its unique research motivation. The distinctive experimental goals further decides the various set of requirements and design criteria for the front end electronics (FEE) and data acquisition (DAQ) at the back-end. The main purpose of the DAQ is to receive the data with high reliability from the FEE near the HEP detector, and then transfer on to...
In this work, we have considered an extension of the standard model (SM) with a $SU(2)_L$ singlet vector-like quark (VLQ) with electric charge $Q=+2/3$. The model also contains an additional local $U(1)_d$ symmetry group and the corresponding gauge boson is the dark photon. The VLQ is charged while all the SM particles are neutral under the new $U(1)_d$ gauge group. Even though in this model...
We investigate a high momentum regime of inflation where the cosmological perturbation breaks down due to large inflationary quantum fluctuations to form the primordial black holes(PBHs). In our study, we have found that, in this region, the values of the Bardeen potential is large negative causing a gravitational instability conducive to the formation of the PBHs. We have used three...
The event-by-event fluctuations of conserved quantities, such as, baryon number, strangeness and electric charge in ultrarelativistic heavy-ion collisions are related to thermodynamic properties of the produced hot and dense system and may reveal the properties of the quark--gluon plasma and the QCD phase diagram. In the present work, the net-charge fluctuations are studied in terms of the...
Neutrino Oscillation has been one of the most promising sources of physics beyond the standard model in many experimental searches so far. Various short and long baseline experiments have been developed using the most advanced detector technologies to detect this elusive particle. NOvA is one such experiment designed with the initial aim of looking at the possibility of the oscillation of muon...
Particulate dark matter captured by a population of neutron stars distributed around the galactic center while annihilating through long-lived mediators can give rise to an observable neutrino flux. We examine the prospect of an idealised gigaton detector like IceCube/KM3NeT in probing such scenarios. Within this framework, we report an improved reach in spin-dependent and spin-independent...
Gas Electron Multiplier (GEM) is one of the most suitable gaseous detector for tracking devices in high rate Heavy-Ion (HI) experiments for their high rate handling capability and good spatial resolution.
The performance studies including the detector efficiency, time resolution, discharge probability and also the radiation induced effects on the chamber such as charging-up effect, long-term...
Two-particle charge-dependent correlations (balance functions) are sen- sitive to the production and transport of conserved quantum numbers in the medium created in hadronic collisions. In this contribution, recent ALICE measurements of the balance functions of charge, strangeness, and baryon numbers are presented. Balance functions for all combinations of identified charged-hadron (π, K, p)...
Results of experiments like LSND and MiniBooNE hint toward the possible presence of an additional eV scale sterile neutrino. The addition of a sterile neutrino will significantly impact the standard three flavor neutrino oscillations in particular giving rise to additional degeneracies due to new sterile parameters. In our work, we investigate how sterile neutrino influences the sensitivity to...
The recoil threshold of Direct Detection experiments limits the mass range of Dark Matter (DM) particles that can be detected, with most DD experiments being blind to sub-MeV DM particles. However, these light DM particles can be boosted to very high energies via collisions with energetic Cosmic Ray electrons. This allows Dark Matter particles to induce detectable recoil in the target of...
The information about Earth's internal structure comes from indirect probes such as seismic studies and gravitational measurements. The density distribution inside the Earth, incorporated in the Preliminary Reference Earth Model (PREM), is estimated from the model-dependent empirical relations having assumptions based on the Earth's temperature, pressure, composition, and elastic properties,...
Lattice QCD predicts an ordering of the ratios of baryon number fluctuations in the vicinity of critical point in the QCD phase diagram i.e, $\frac{\chi_6}{\chi_2}<\frac{\chi_5}{\chi_1}<\frac{\chi_4}{\chi_2}<\frac{\chi_3}{\chi_1}$ where $\chi_n$ is the nth order cumulant of baryon number fluctuation. Taking the analog of baryon density as order parameter in the spin model, these inequalities...
A real-sized trapezoidal Resistive Plate Chamber (RPC) has been developed for the Muon Chamber (MuCh) detector set-up in the upcoming Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR), Darmstadt, Germany. The detector has been tested for its performance with dedicated self-triggered electronics and DAQ chain in presence of a very harsh photon...
The Taylor expansion of thermodynamic observables at a finite baryon chemical potential $\mu_B$ is a well-known approach to circumvent the fermion sign problem. The reliability of a Taylor estimate is determined by the radius of convergence, a reasonable estimate of which requires sufficiently higher order calculations in $\mu_B$. But, owing to the associated difficulty and limitations of...
Neutrinoless double-$\beta$ decay (0$\nu \beta \beta$) is the most sensitive
experimental probe to answer the question whether neutrinos have Majorana or Dirac
nature. The observation of (0$\nu \beta \beta$) would not only establish the Majorana
nature of neutrinos, but also provide a measurement of effective mass and probe the
neutrino mass hierarchy. The latest precise neutrino...
The CMS Level-1 trigger, including the calorimeter trigger, will receive a massive upgrade to avail of the benefits and tackle the challenges posed by the High-Luminosity LHC (HL-LHC). Calorimeter trigger is planned to employ high-speed optical links (~28 Gbps) and Xilinx Large UltraScale+ FPGA to meet the high bandwidth and parallel computing demands of the HL-LHC. The system will handle 25...
We discuss the imprint of high scale non-thermal leptogenesis on cosmic microwave background experiments from the measurement of spectral index ($n_s$) and tensor to scalar ratio ($r$) which is otherwise inaccessible to the conventional laboratory experiments. We argue that non-thermal production of baryon (lepton) asymmetry from tree level inflaton decay is sensitive to the reheating dynamics...
In the Standard Model a Dark Matter candidate is missing, but it is relatively
simple to enlarge the model including one or more suitable particles.
We consider in this paper one such extension, inspired by simplicity and
by the goal to solve more than just the Dark Matter issue.
Indeed we consider a local $U(1) $ extension of the SM providing an
axion particle to solve the strong CP...
The ATLAS and CMS collaborations have measured the Higgs boson in a variety of production and decay modes. These measurements still leave room for exotic Higgs boson couplings proposed by simple extensions of the Standard Model (SM). In recent years much effort has been put into looking for the 125 GeV Higgs decaying to two light pseudoscalars which then decay to bb, mumu, tautau etc. In this...
Jets are studied in photoproduction produced in ep collisions at the proposed EIC energies, $\sqrt{s}$= 30-140 GeV. The contribution of the photoproduction subprocesses, direct and resolved, are studied separately. The data are generated using the event generators, PYTHIA8 and RAPGAP. The jets are reconstructed using the longitudinally invariant kT-algorithm in the standalone software package...
The hadron resonance gas (HRG) model which considers a grand canonical ensemble of all the experimentally established hadrons and resonance states, is very successful in reproducing the LQCD results of the hadronic phase of the strongly interacting matter. Various extensions of the HRG model have been made to improve its agreement with LQCD results. One such extension is the implementation of...
I will take an overview of the latest progress in theory model space of dark matter candidates. I will in particular concentrate on new class of dark matter theories, where dark matter is a composite particle arising through confinement in a secluded non-Abelian confining sector. I will sketch the principles behind construction of such theories, demonstrate the usage of lattice computations...
There is an overwhelming evidence of the existence of dark matter (DM) from observations at different scales, from galaxies to the whole Universe, supporting that a large fraction of the
mass and energy budget cannot be explained within the standard cosmological model. Weakly Interacting Massive Particles (WIMPs) have been proposed to be most interesting DM candidates. Different complimentary...
Understanding the thermodynamics of strongly interacting matter described by Quantum Chromodynamics (QCD) lies at the core of explaining, for e.g., the formation of an overwhelming fraction of the visible matter in the universe and the dense baryon matter that exists at the core of the neutron stars. Lattice QCD techniques have provided some spectacular results in this field, specially in the...
The Galactic cosmic ray particles in the inner heliosphere are convected outward by the solar wind while they diffuse into the inner heliosphere along the interplanetary magnetic field direction. A balance between the two processes produces an anisotropic flow of the GCR particles. The ground-based neutron or muon detectors can observe it as a 24-hour periodic variation in their counting rates...
A number of anomalous results in short-baseline oscillation may hint at the existence of one or more light sterile neutrino states in the eV mass range and have triggered a wave of new experimental efforts to search for a definite signature of oscillations between active and sterile neutrino states. This new neutrino would have to be a Standard Model gauge singlet, thus it is referred to as...
The ATLAS and CMS experiments have analyzed about $140 fb^{-1}$ data which was collected during Run 2 of the LHC. There are several beyond standard model searches that are/will be carried out by these experiments. A brief summary of recent supersymmetry searches is presented. The talk discusses current limits on strongly produced SUSY particles, electroweakinos and sleptons. Some of the...
Observation of the rotational velocity of stars in our galaxy and other gravitational effects point to the existence of huge non-luminous matter which is known as Dark Matter. The most promising candidate of dark matter is the weakly interacting massive particles (WIMPs). They naturally give the appropriate relic abundance and also appear in the theories of weak scale physics beyond the...
Instrumenting a gigaton of ice at the South Pole, the IceCube Neutrino Observatory can probe neutrino interactions and properties at high energies with large statistics. This is possible due to the existence of a flux of high-energy astrophysical neutrinos, discovered by IceCube in 2013-14, and the prevalence of neutrinos produced in cosmic ray interactions in the upper atmosphere. Recently,...
A 50 kt Iron CALorimeter (ICAL) has been proposed to study atmospheric neutrinos using Resistive Plate Chambers (RPCs) as the active detector elements. It’s proposed location is an underground cavern in a mountain, to reduce the cosmic muon background. A scaled down (1/600) version of the ICAL called the mini-ICAL has been constructed and is being operated at the IICHEP transit campus in...
Thermal photons from the QGP provide important information about the interaction among the plasma constituents. The photon production rate from a thermally equilibrated plasma is proportional to the transverse spectral function $\rho_T$(𝑘0=|𝑘⃗ |,𝑘⃗ ). Photon production rates can also be calculated from the difference between $\rho_T$(transverse) and $\rho_L$(longitudinal) correlator as...
Measurement of the number of effective relativistic degrees of freedom (Neff) by Planck experiment at Cosmic Microwave Background (CMB) strongly restricts the presence of additional light particles in the early Universe. We first discuss the cosmological constraints on MeV scale thermal dark matter from the current Planck data. Next we consider an MeV scale thermally decoupled non-minimal...
The mixing among three light active neutrinos is parametrized using the unitary PMNS matrix. If there are additional neutrinos present in Nature which are heavy iso-singlets, then the effective mixing matrix for the light three active neutrinos would be non-unitary. Because of this non-unitary neutrino mixing (NUNM), the oscillation probabilities between the three active neutrinos would be...
In heavy-ion collisions, a strong magnetic field ($\sim$ 10$^{15}$ T) is expected to be created, which together with the presence of a non-zero vector and axial currents, gives rise to a collective excitation in the quark--gluon plasma (QGP) called the Chiral Magnetic Wave (CMW). The experimental signature of the CMW is charge-dependent elliptic flow, $v_{2}$. In particular, the normalized...
The study of tauon($\tau$-lepton) is one of the topics of current interest as its understanding is required for various important aspects such as to test the lepton flavor universality, for the accurate measurement of the neutrino oscillation parameters, to reduce the uncertainties in the $\nu_l-$nucleus cross section measurements, etc. Since the tauon has higher threshold and very short...
Compressed Baryonic Matter (CBM) is a fixed target experiment, which will explore the properties of nuclear matter under extreme density. This experiment will take place in the upcoming Facility for the Antiproton and Ion Research (FAIR) at Darmstadt, Germany. CBM will consist of 4 stations of Muon- Chambers (MuCh) sandwiched between absorber layers and each station will consist of 3 layers of...
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 $Λ_b→Λμ^+ μ^-$ transition at the Fermilab [1] and the LHCb [2]. Theoretically these decays are also studied at different NP models...
Primordial black holes are one of the most well-motivated dark matter candidates and it is important to devise new search strategies for them. Low-mass PBHs (masses between $\sim 10^{15}$ g to $10^{18}$ g) can be detected via their Hawking radiation. Evaporating PBHs inject energy into the intergalactic medium (IGM), which can significantly alter the thermal and ionization history of the...
We study the effect on thermal vorticity near the QCD critical point. To evaluate thermal vorticity, we solve the equations for the relativistic causal hydrodynamics in (3+1) dimensions. The effects of the critical point is incorporated through the equation of state and the scaling behaviour of the transport coefficients. We observed a significant suppression in thermal vorticity at late times...
Experiments conducted in the last decade to search for the Chiral Magnetic Effect (CME) in heavy-ion collisions have been inconclusive. Isobar program at RHIC was conducted to address this problem. Also, in order to study the CME, a new approach known as the Sliding Dumbbell Method (SDM) [1] has been developed. This method searches for the back-to-back charge separation on an...
The large area GRAPES-3 muon telescope (G3MT) is designed to record the muon component of the extensive air shower (EAS), playing an important role in the determination of the composition of primary cosmic rays (PCRs) and separation between γ-rays and cosmic rays primaries for γ-ray astronomy. These studies require a detailed understanding of the response of EAS components in the G3MT which...
We build different gauged $U(1)_X$ models ($X = B, L B+L$) by finding anomaly free solutions. We analyse their phenomenological implications focusing on proton decay. We find that the $U(1)_L$ model is the most interesting case. We analyse the possibility of the gauged $U(1)_L$ breaking to a residual Z_3 subgroup and show that it leads to novel proton decays. We find that the usual two-body...
We investigate a left-right symmetric model obeying $SU(3)_C \otimes SU(2)_L \otimes U(1)_L \otimes SU(2)_R \otimes U(1)_R$ local gauge symmetry. We consider the fermions of full $\bf{27}$-plet of $E_6$. Having one bi-doublet, two doublet and one singlet scalar is necessary for a complete symmetry breaking to Standard Model. Its rich particle sector is one of the reasons behind our interest in...
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$_1$ and TM$_2$ mixing matrix. We predict the value of sum of neutrino masses and effective Majorana masses for all the patterns. We also analyse the variation of total...
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 $\Pi$ with the truncated form $\tau \dot{\Pi}+\Pi=-3\xi H$, where $\tau$ is the relaxation time, and $\xi$ is the bulk viscosity...
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 $\tan\beta$ are about $10^7$ GeV and 41, respectively, while the mass of neutralino LSP turns out to be about a TeV.
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$-$Pb collisions at $2.76$ TeV center of mass energy per nucleon for bottomonium (1S) state. The bottomonium bound states produced in the early hard scattering stage of collision traverses the Quark-Gluon Plasma (QGP) medium. We calculate a survival...
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 $W$ boson mass in the Dirac scotogenic framework. We...
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$\times$2m Resistive Plate Chambers (RPCs) in between them. The gap between two iron plates is 4.5 cm. The miniICAL was commissioned in 2018 and...
Properties of nuclear matter at density beyond nuclear saturation density ($n_0$) are not well understood. Compact star is unique laboratory to provide us with a plenty of information for studying such dense nuclear matter. According to Bodmer and Witten conjecture, strange quark matter (SQM) composed of up ($u$), down ($d$) and strange ($s$) quarks could be true ground state of strongly...
In this work, we focus on the complementarity between the two upcoming long-baseline experiments: DUNE and T2HK, in establishing the leptonic CP violation at 3$\sigma$ C.L. for atleast 75% of the Dirac CP phase ($\delta_{\mathrm{CP}}$). We find that DUNE + T2HK combinedly can achieve the desired CP coverage of 75% with only half of their individual nominal exposures, while independently, they...
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 $^7Li$ abundance in the early Universe, the $^3H(\alpha,\gamma)^7Li$ radiative-capture process is of great astronomical relevance. The calculations of primordial nucleosynthesis offer some thorough and comprehensive assessments of...
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 $\mathcal CP$-violating anomalous $ht\bar{t}$ couplings via associated production of Higgs boson at the LHC and its future variants using a set of newly proposed T-odd observables involving momentum of final state particles. Limits on such couplings are also presented using the production asymmetries associated with the process $pp \to t(-> l^{+}\nu_l...
Using renormalisation group equations (RGEs) we study the radiative corrections of different models of neutrino mass patterns at different values of high seesaw scale $M_R$ and $\tan \beta$ with the variation of SUSY breaking scale $m_s$. Different neutrino mass patterns are found to behave differently under the analysis. Small value of $\tan \beta$ is found preferable for NH case wheres...
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 $Z_3$-invariant Next-to-Minimal Supersymmetric Standard Model (NMSSM), in the light of recent experimental results from the Higgs sector, dark matter (DM) searches and those from the searches of the lighter chargino and...
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$^{2}$) is under construction to...
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 $K^*(892)^0$ meson, and thus varying yields has been used extensively to study the hadronic phase lifetime. In this work, we employ an alternative method by assuming 1+1D second-order...
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 $(SU(2)_{L} \times U(1)_{Y})$.
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 $M^+_1 \rightarrow l^+_i l^\pm_j π^\mp$, that arise in a TeV scale Left Right Symmetric model (LRSM) with degenerate or nearly degenerate right-handed (RH) neutrinos. LRSM contains three RH neutrinos and a RH gauge boson. The RH neutrinos with masses in the range...
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 $J^P={1/2}^+$ and ${3/2}^+$ baryons through the intrinsic mass difference between $u$ and $d$ quarks. We have been calculated the electromagnetic and strong hyperfine contributions arising from the quark-quark interactions in the framework of effective mass scheme. We exploit the experimental information to obtain the effective masses of the...
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 $m_{\nu_1}$, Jarlskog's rephasing invariant $J$, CP violating phase $\delta$ and effective neutrino...
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 $\pi$, $K$ and, p transverse momentum spectra in the rapidity region...
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 $4.2 \sigma$ discrepancy with the theoretical prediction which is a robust signal for physics beyond the SM. In this work, we consider $U(1)_{L_{\mu}-L_{\tau}}$ extension of the scotogenic model to explain non-zero neutrino mass and muon ($g-2$), simultaneously. It is known that muon neutrino trident (MNT) process put an...
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$_2$ mixing scheme, wherein (2, 2) element of the effective low energy neutrino mass matrix $M_\nu$ is, also, equal to the $``\textit{magic sum}"$. The new constraint reduces the number of free parameters making the mass matrix highly predictive with strong correlations and homoscedasticity...
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 ${\log}^{i}(1-z)$ to $\overline{\text{NNLL}}$ accuracy and matching them systematically to the fixed order NNLO cross-sections. These results...
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 $\sigma, \zeta, \delta, \chi$ and the vector fields $\omega, \rho$ at finite temperature and chemical potential. Non-extensive effects have been introduced...
We analyse $\mathcal CP$-effects of the anomalous hVV vertices (with V = W, Z, $\gamma$) through Higgs allied processes in the context of LHC and it's proposed variants. Sensitivities to such interactions would also be discussed for various detection modes of Higgs for the aforementioned colliders.
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 $A_{5}$ discrete symmetry group is used to construct a neutrino mass model that can reproduce deviation from golden ratio mixing. Here, the neutrino masses are obtained through Type-I see-saw mechanism. The neutrino masses and mixing patterns predicted by the model can explain the current data with good accuracy. In this work, the correlation between neutrinoless double beta decay...
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 $99.99\%$ and false positive rate of less than $10^{-5}$. The CMVD consists of veto...
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 ($\Delta m^2_{41}\simeq$1 eV$^2$) much larger than the standard atmospheric ($\Delta...
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 ($\sim \mathcal{O}(10^{56})$). This neutrino emission takes place in three different phases, namely the {\it neutronisation burst, accretion and cooling} pertaining to different physical processes. Interestingly,...
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 $\kappa$-deformed Dirac field by adopting a quantisation method that uses only equations of motion for quantising the field. Starting from $\kappa$-deformed Dirac equation, valid up to first order in the deformation parameter $a$, we derive deformed unequal time anti-commutation relation between deformed field and its adjoint, leading to an undeformed oscillator...
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' $Z_2$ symmetry is needed to explain the DM stability and it does not shed any light on the flavor structure of neutrino, that's why for the explanation of flavor structure of neutrino one has to add...
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 $J^P={1/2}^+$ and ${3/2}^+$ states, in the framework of screened quark charge. We analyze the modification of quark charge by employing screening effect on quark charge...
Recently, Tibet $AS_{\gamma}$ has discovered the long-awaited detection of diffuse gamma-rays with energies between 100 TeV and 1 PeV from the Galactic disk region, thus proving the existence of Galactic PeVatrons. It has been shown that these data broadly agree with prior theoretical expectations. We study the possible implication of these gamma-rays within the well-motivated scenario of...
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 $7\sigma$ statistical significance, we consider a singlet-doublet (SD) Majorana fermion dark matter (DM) model where the required correction to W boson mass arises from radiative corrections induced by SD fermions. While a single generation of SD fermions, odd under an unbroken $Z_2$ symmetry, can not...
We have studied the mass spectra and decay rates of fully heavy pentaquarks systems $QQQQ\bar{Q}$ (where $Q= c,b$) by using a non-relativistic potential model. In this model, a complex five-body problem is reduced to a simpler two -body problem. The Schrodinger wave equation has been solved numerically with Cornell-type potential. The non-relativistic potential includes Spin-Spin, Spin-Orbit...
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 $\theta_{23}$. Additionally, the ancillary goals of...
The measurements on lepton flavor universality violation in semileptonic $b\to s$ and $b\to c$ transitions hint towards a possible role of new physics in both sectors. Motivated by these anomalies, we investigate the lepton flavor violating $B\to K^*_2 (1430)\mu^{\pm}\tau^{\mp}$ decays. We calculate the two-fold angular distribution of $B\to K^*_2\ell_1\ell_2$ decay in presence of vector,...
This contribution study the correlation between two global observables of an event activity i.e. the relative transverse multiplicity activity classifier ($R_{\rm {T}}$) in Underlying Event (UE) and transverse spherocity ($S_{0}$) in proton-proton collisions. This would allow us to understand the soft particle production using the differential study of $R_{\rm {T}}$ and $S_{0}$. We have used...
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 $Q^2 > 125$ GeV$^2$ are presented, for three center of mass energies, $\sqrt{s}$ = 63.2, 104.9 and 141 GeV.
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, $\Omega_{DM}h^2 \sim
0.120 \pm 0.001$, with data from both Planck and WMAP.
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, $\sum_{i}|m_{i}|< $0.23 eV. We consider ($10^{13}-10^{15}$) GeV as high...
A review of results related to the so called B anomalies is presented. The results come both the e+e- B factories and LHC. The talk concludes with a discussion of some the recent results from Belle II experiment related to anomalies.
The energy deposition due to the pair annihilation of neutrinos into electrons can energize events such as gamma ray bursts (GRBs). This energy deposition can also be enhanced in different spacetime backgrounds. In this talk I will discuss whether an inclusion of $Z^\prime$ mediated neutrino annihilation process can alter the energy deposition. Comparing with the GRB observation data, we...
Loosely bound light nuclei are produced in abundance in heavy-ion collisions. There are two main possible models to explain their production mechanism - the thermal model and the coalescence model. Thermal model suggests that the light nuclei are produced from a thermal source, where they are in equilibrium with other species present in the fireball. However, due to the small binding energies,...
Indian Scintillator Matrix for Reactor Anti-Neutrinos (ISMRAN) experiment is a very short-baseline (~ 13 m from the reactor core) and above-ground reactor anti-neutrino experiment, aiming to measure the energy spectrum of anti-neutrinos from the Dhruva research reactor, BARC, Mumbai. ISMRAN experiment is also sensitive to searching for sterile neutrino and monitoring the reactor thermal...
In order to cope with very high radiation dose and hadron fluences at the High Luminosity Large Hadron Collider (HL-LHC), a new silicon Inner Tracker will be built for the Phase-2 Upgrade of the CMS experiment. The new Inner Tracker will contain 2 billion silicon pixels. These pixel modules will be composed of pixel sensors with pixel size of 100x25 um2 or 50x50 um2 and a new ASIC, designed in...
Diffuse gamma-ray emission by interactions of ultra-high-energy cosmic rays (UHECRs) with the 2.7K cosmic microwave background (CMB) is expected to have an isotropic distribution around 10—100 TeV. This radiation carries the information on the distribution of energetic sources and hence the cosmological evolution of the universe. The GRAPES-3 array comprises ∼ 400 densely packed scintillator...
A 256-pixel imaging camera for a 4-meter class Imaging Atmospheric Cherenkov Telescope (IACT) is being developed in house by TIFR. The camera uses a 4 x 4 array of SiPMs as photodetector for each pixel. The pixel signals are pre-conditioned in the front-end electronics modules and fed to back-end modules. The front-end electronics comprises the modules for pre-amplification and biasing of...
The goal of the Short Baseline Neutrino (SBN) program is to definitively address observed anomalies that may originate from short baseline neutrino oscillations and to search for evidence of the existence of light sterile neutrinos with unprecedented sensitivity in eV^2 mass range. In the SBN experiment, the near detector (SBND) is close to the source and the intermediate detector is...
Primordial Black Holes (PBHs) in the mass range $\sim 10^{17}- 10^{22}$g are currently unconstrained, and can constitute the full Dark Matter (DM) density of the universe. Motivated by this, in the current work, we aim to relate the existence of PBHs in the said mass range to the production of observable Gravitational Waves (GWs). We follow a model-independent approach assuming that the PBHs...
The fireball of quarks and gluons formed in relativistic heavy ion collisions converts to hadrons as it cools below the chiral crossover temperature $(T_{CO})$. The hadrons so formed may further interact till a point where the densities are low enough to make the reaction rates negligible. After this the yields of individual species do not change significantly and get essentially fixed. This...
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....
Prospects of direct and indirect detection of DM are distinctively correlated to the phase space distribution of DM within the galactic haloes. A promising avenue to detect and constrain the properties of particulate DM is to explore the capture and subsequent heating signatures of DM annihilation from astronomical objects. The aim of this article is to systematically study the impact of...
Identification of low transverse energy photons from the calorimeter energy deposits is a challenging task in a hadron collider environment. The electromagnetic calorimeter subsystem of CMS has an average noise level of about 30 MeV (80 MeV ) in the Barrel (Endcap) region. The existing photon Identification scheme in proton-proton collisions for the CMS experiment is effective for photons...
The proposed magnetized iron calorimeter (ICAL) by the INO collaboration is a 51 kTon detector made up of 151 layers of 56 mm thick iron having an air gap of 40 mm in between each iron layer where Resistive Plate Chambers (RPCs), active detectors providing position and timing information, will be placed. ICAL is designed to detect muons generated by the charge current interaction of the...
We study the thermoelectric response of a thermal medium of deconfined quarks and gluons in the framework of relativistic kinetic theory. The response of the medium is quantified by the Seebeck and Nernst coefficients which relate the mutually longitudinal and transverse components, respectively, of the induced electric field and the temperature gradient. To obtain the above coefficients, we...
We constrain the parameter space of a simplified dark matter model with a spin-0 mediator and a fermionic dark matter from low energy observables like anomalous magnetic moment, FCNC processes like neutral meson mixing, rare decays of $ B_0, B_s^0, K $ meson, semileptonic $ b \to s \ell \ell $ decays, invisible decays of B and K meson and process like $ t \to b W_{\mu} $ decay. FCNC is...
The Accelerator Neutrino Nucleon Interaction Experiment (ANNIE) at Fermilab is designed to measure the final-state neutron multiplicity of the neutrino-nucleus interaction. The ANNIE's Gadolinium-loaded water Cherenkov detector is situated in the Booster Neutrino Beam (BNB) at Fermilab. The measurements of ANNIE are crucial for future long-baseline neutrino experiments since a better...
In the standard cosmological model the universe is assumed to
be statistically isotropic & homogeneous when averaged on large scales. The dipole anisotropy of the CMB is ascribed to our peculiar motion due to local inhomogeneity. There should then be a corresponding dipole in the sky map of high redshift sources. Using catalogues of radio galaxies and quasars we find that this expectation is...
The GRAPES-3 experiment is home to the world’s largest muon telescope containing nearly 4000 proportional counters of each dimension 6m x 6 m x 0.1m. Construction of another large muon telescope is currently under progress which is expected to enrich the physics potentials of GRAPES-3 in addressing the origin of Galactic cosmic rays, through accurate measurements of cosmic ray composition as...
Photons provide snapshots of the evolution of relativistic heavy-ion collisions as they are emitted at all stages and do not interact with the medium strongly. With access to the versatility of RHIC, measurements of low momentum direct photons are made possible across different system size and beam energies. An excess of direct photons, above prompt photon production from hard scattering...
For better understanding of neutrino properties, we require precision measurements of the oscillation parameters. Presently the systematic uncertainties in these parameters are large, to which 20-25\% arises due to the lack in the understanding of $\nu/\bar \nu$-N and $\nu/\bar \nu$-A cross sections. Future high precision measurements require the systematic uncertainties to be reduced to...
Elastic light-by-light scattering, $\gamma\gamma\rightarrow\gamma\gamma$, is a pure quantum mechanical process, also proposed as a sensitive channel to study physics beyond the standard model. We present the first combination of $\gamma\gamma\rightarrow\gamma\gamma$ cross-section measurement at the LHC, using lead-lead data recorded by the ATLAS and CMS collaborations at 5.02 TeV with the aim...
The study of B decays has led to a much better understanding in the flavor sector of the SM. In the CP-violation study, the measurement of sin(2β) has an important role. The “golden channel” Bd0 → J/ΨKs0, plays an outstanding role for a clean measurement of sin(2β), where β is one of the angles of the CKM unitarity triangle. The channel Bs0 → J/ΨKs0, is related to Bd0 → J/ΨKs0 through...
Motivated by the various theoretical studies regarding the efficient capturing of dark matter by neutron stars, we explore the possible indirect effects of captured dark matter on the cooling mechanism of a neutron star. The equation of states for different configurations of dark matter admixed star at finite temperature is obtained using the relativistic mean-field formalism with the IOPB-I...
Although an integral part of the Standard Model, neutrinos still remain the least understood of all known fundamental particles. There are many open questions in neutrino physics, starting from their very nature to their mass generation, their mixing and oscillation patterns. In this talk, I will cover the current theoretical understanding of neutrinos and the various open questions that...
With the establishment of the oscillation phenomena, neutrino physics is entering a precision era, although there are still several unknowns, such as the neutrino mass ordering, possible CP violation in neutrino physics, amongst others. In this talk, I will review the current experimental status of neutrino physics and the planned experiments at least in the next two decades which will enable...
Future colliders are necessary to understand the Higgs boson at percent level precision. Any deviations at percent level in the Higgs sector points to new physics at 10 TeV scale. Natural choice made by the world community calls for a plan to build an electron-positron Higgs factory followed by a 10-TeV scale collider, using 100-TeV center-of-mass proton-proton collider or a 10-TeV muon...
In 2020 the US Department of Energy announced its intention to build the Electron Ion Collider (EIC) at Brookhaven National Laboratory. Immediately, an EIC project team consisting of scientists from BNL and Jefferson Laboratory was formed and project moved forward. It has gone through important critical decisions and evaluations since then and poised to start construction in 2025 culminating...
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 $B-L$ to be an exact symmetry, we make an attempt to explain the observed proportionality between the relic densities of dark matter (DM) and baryonic matter in the present Universe ${\it i.e.,}\,\, \Omega_{\rm DM} \approx 5\, \Omega_{\rm B}$. Assuming the existence of heavy...
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/$c^2$) search has been a primary objective for direct detection experiments over the last few years. The SuperCDMS HVeV Si detector is sensitive to low-mass dark matter candidates due to the $\mathcal O$(eV) energy resolution ability. Based on the Neganov-Trofimov-Luke (NTL) principle, the phonon-sensitive HVeV device can distinguish the single charge excitations...
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$\rightarrow$2 process can make the DM temperature to cool at much slower rate than the standard non-relativistic...
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 $e^{+}e^{−}$ collider and has acquired the world’s highest instantaneous luminosity this year. Charged particle identification (PID) in Belle II is provided by the TOP (Time Of Propagation) counters in the barrel region. We report the overall and TOP-focused PID performance in recently recorded 208 $fb^{−1}$ data with the...
Gamma-ray bursts (GRBs) are the most luminous (events in the Universe after the big bang with $ E_{\gamma, iso} \approx 10^{48}-10^{54} erg $), the brightest and short time (lasting from few seconds to few hours) flash of very high energy electromagnetic radiation occurring at an average rate of one event per day at cosmological distance, explosions of the universe. These astrophysical events...
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 $S_1(\bar{\textbf{3}},\textbf{1},1/3)$ scalar leptoquark. An additional lepton type singlet fermion is included, whose admixture with vector-like lepton doublet plays the role...
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 ($\eta$) and bulk ($\zeta$) viscosities, whereas the chemical potential enhances these viscosities. Thus,...
We use Machine Learning with an event-generator (Sar$t$re) for
the process: $e \p\rightarrow e'\ p' \ V_M $, $e \ A\rightarrow e'\ A' \ V_M $ .
Sar$t$re uses 3-dimensional look-up tables to generate events
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 $k-$essence dark energy model with Lagrangian $L=VF(X)$, with a constant potential $V$ and the dynamical term $X = (1/2)\nabla_{\mu}\phi\nabla_{\nu}\phi = \dot{\phi}^2/2$ for a homogeneous scalar field $\phi(t)$, in a flat FRW spacetime background. Scaling relations are used to extract temporal behaviour 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)$_{e,\mu}$ measurements deviate from the Standard Model (SM) predictions and motivate towards the new physics beyond the SM. In this work, we propose a model with the minimal field content in the framework of anomaly free extension of...
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 ($ \eta $) values is an important probe to study the underlying mechanism of particle production. Forward-backward correlation is a significant tool to understand the dynamics of multi-particle production as it is believed to be free from final state effects. The forward-backward correlation strength ($ b_{corr} $) has been...
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...
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 $b→s$ transition have depicted the possibility of lepton flavour violation (LFV) indicating the existence of new physics (NP) as the LFV decays are strongly suppressed in the standard model (SM). In the last few years, experiments have obtained the upper limit of the branching fractions to be of the order of $10^{-5}$ for...
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...
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) $b→c\bar l ν_l$ transitions have gained special attention both in experiment and in phenomenological study to explore new physics (NP) beyond the standard model (SM). Recently, the BaBar, Belle and LHCb have measured lepton flavour universality (LFU) ratios $R_{D^{(*)}}$ and the world average values of the colliders exhibited around...
The 2m$\times$2m single gap Resistive Plate Chambers (RPCs) are used as the active detector elements in the mini-Iron Calorimeter (miniICAL) detector at IICHEP, Madurai. Single Gap RPCs are known to provide a time resolution on the order of $\sim$1 ns. The position resolution is mainly dependent on the strip width. For the miniICAL RPCs the strip width is $\sim$3 cm, which provides a position...
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 $a(t)={\frac{a(1+3t^2\sigma)}{2}}^\frac{1}{3}$ and the modified Chaplygin gas is characterized by the barotropic equation of state (EoS) $p=\epsilon\rho- (1+\epsilon)A\rho^{-\gamma}$. The EoS...
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-$N$ limit is one such conjectured formulation for a ten-dimensional type IIB superstring. In this model, a smooth space-time manifold is expected to emerge from the eigenvalues of the ten bosonic matrices. When this...
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) $h_3(x, {\bf p_\perp^2})$ for the proton has been examined in the light-front quark-diquark model (LFQDM). By deciphering the unintegrated quark-quark correlator for semi-inclusive deep inelastic scattering (SIDIS), we have derived explicit equations of the TMD for both the scenarios when the diquark is a scalar or...
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 $\mathcal{𝑍}_2$ parity. This model is phenomenologically attractive as it is designed to dynamically generate small neutrino masses, provide viable dark matter candidates and also account for the current value of the $(g_{\mu}−2)$...
Radiative transitions between quarkonium states are interesting and are characterized by $\Delta L=0$ are the magnetic dipole, M1 transitions, while those characterized by $|\Delta L|=1$ are the electric dipole, E1 transitions. The M1 transition mode is sensitive to relativistic effects, specially between different spatial multiplets (where $n > n'$), while the E1 transitions are much stronger...
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, $M^2$ ) and ($n_r$, $M^2$ ). It nicely fit on data. Our results...
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 $\Delta(1232)$ resonance. We also include higher resonances(four-star in PDG) such as $P_{11}(1440)$, $D_{13}(1520)$, $S_{11}(1535)$, $S_{11}(1650)$ and $P_{13}(1720)$, which helps us to extend the model to higher...
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 $A_4 \times Z_4$ discrete symmetry extension of Standard Model to develop a model of neutrino masses and mixings in 3+1 scheme within the Minimal Extended Seesaw mechanism. We consider an $A_4$ triplet right-handed neutrino N and...
Neutrino physics gives us an opportunity to investigate new physics beyond the standard model. Recent data from the two long-baseline accelerator experiments, NO$\nu$A and T2K, appear to show some discrepancy in the standard 3-flavor scenario. Here, we intend to explore the next generation of long-baseline neutrino experiments T2HK and DUNE. We study the sensitivities of the non standard...
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 ($0\nu\beta\beta$) decay in the constrained scenario of hybrid textures of neutrino mass matrix. In our previous work, we obtain a connection between ($0\nu\beta\beta$)-decay and DM. As a result, we get six hybrid textures, which reproduce correct low energy phenomenology....
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 $V_{cs}$ and $V_{cd}$ are well known, CP asymmetries and $D^{0}$-$\bar{D^0}$ oscillations are small. It has been pointed out that the c$\rightarrow$ u$\gamma$ decays might have some contributions from the non-minimal supersymmetry, which is...
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 ($\lambda_{ijk}L_i.L_je_k^c$) allows the...
The lack of information before Big Bang Neucleosynthesis (BBN) allow us to assume the presence of a new species $\phi$ whose energy density redshifts as $a^{-(4+n)}$ where $n>0$ and $a$ is the scale factor. In this non-standard cosmological setup, we have considered $U(1)_{L_\mu-L_\tau}$ $\otimes U(1)_X$ gauge extension of the Standard Model (SM) and studied different phases of the...
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...
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 $C_{11}=0$, $C_{12}=0$ and $C_{13}=0$ by imposing the zero...
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 $10^{6}$ at a depth of 1 km. The same order of reduction in cosmic muon flux at a shallow depth (100 m) 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 $4.2 \sigma$. Significant anomalies in data have also been observed in the semileptonic $B$-meson decay observable called $R_{K^{(*)}}$. These anomalies might not be independent ones and could...
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Plenary Speaker : 6 pages
Mini-review : 5 pages
Parallel speaker :4 pages
Posters : 2 Pages.
The two B-factory experiments (Belle at KEKB, BaBar at PEPII) observed the first large signals for CP violation (matter-antimatter asymmetries) in the B meson sector in 2001. These results demonstrated Kobayashi and Maskawa's hypothesis for the origin of the CP violation is correct and provided the experimental foundation for their 2008 Nobel Prize in Physics. Belle II, the first super...
The Standard Model (SM) theory of Particle Physics has been very successful in explaining a large number of physics processes.
However, the theory is incomplete as it doesn't address the problems such as neutrino masses, dark matter, dark energy, and many more.
This requires us to look at the physics processes beyond SM. The two general-purpose detectors at LHC, namely CMS and ATLAS,...
Relativistic heavy ion collisions are an important tool in mapping the phase diagram of Quantum Chromodynamics and understanding the properties of Quark Gluon Plasma. In this talk, we will shed light over the recent results from RHIC and how it would compliment the physics program at FAIR.
