Conveners
Poster - 2: D2
- Satyajit Jena (IISER Mohali)
- Vishal Bhardwaj (IISER Mohali)
- Ambresh Shivaji (IISER Mohali)
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...
