A5052607869- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Nuclear physics research studies
- Computational Physics and Python Applications
- Optimal Experimental Design Methods
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Advanced Statistical Methods and Models
- Statistical Methods and Inference
- Manufacturing Process and Optimization
- Cold Fusion and Nuclear Reactions
- Spectroscopy and Quantum Chemical Studies
- graph theory and CDMA systems
- Particle accelerators and beam dynamics
- International Science and Diplomacy
- Radiation Therapy and Dosimetry
- SARS-CoV-2 detection and testing
- Atomic and Subatomic Physics Research
Indian Association for the Cultivation of Science
2016-2025
Marwadi University
2024
Stornoway Historical Society
2023
Shaheed Suhrawardy Medical College
2022-2023
Saurashtra University
1994-2021
Helsinki Institute of Physics
2010
University of Helsinki
2010
Physical Research Laboratory
2008-2009
University of Delhi
2007
University of Oregon
2003-2005
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
The relativistic degrees of freedom (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>N</a:mi><a:mi>eff</a:mi></a:msub></a:math>) is one the crucial cosmological parameters. precise measurement <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msub><c:mi>N</c:mi><c:mi>eff</c:mi></c:msub></c:math> at time cosmic microwave background formation, by Planck 2018 can be used to understand new fundamental interactions, in particular...
The minimal SU(5) theory augmented by the fermionic adjoint representation restores coupling constant unification and gives realistic neutrino masses mixing through hybrid Type I III seesaw. crucial prediction of is an SU(2) lepton triplet with mass below TeV. We study signature these heavy leptons propose strategy to test this mechanism at hadron colliders. smoking gun evidence Delta L=2 number violation events a pair like-sign plus four jets without significant missing energy find that via...
We study a simple extension of the Standard Model supplemented by an electroweak triplet scalar field to accommodate small neutrino masses type-II seesaw mechanism, while additional singlet can play role cold dark matter (DM) in our Universe. This DM candidate is leptophilic for wide range model parameter space, and lepton flux due its annihilation carries information about mass hierarchy. Using recently released high-precision data on positron fraction from AMS-02 experiment, we examine...
The type II seesaw model is a well-motivated new physics scenario to address the origin of neutrino mass issue. We show that this can easily accommodate an absolutely stable vacuum until Planck scale, however with strong limit on exotic scalar masses and corresponding mixing angle. examine prediction at current future high luminosity run Large Hadron Collider (LHC) for angles fixed such high-scale valid region. Specifically, we device associated pair production charged scalars as probe LHC....
We consider a two-Higgs doublet scenario containing three $SU(2{)}_{L}$ singlet heavy neutrinos with Majorana masses. The second scalar as well the are odd under ${Z}_{2}$ symmetry. This not only generates masses for light radiatively but also makes lighter of neutral ${Z}_{2}$-odd scalars an eligible dark matter candidate, in addition to triggering leptogenesis at scale neutrino Taking two representative values this mass scale, we identify allowed regions parameter space model, which...
Abstract The basic idea of this work is to achieve the observed relic density a non-thermal dark matter(DM) and its connection with Cosmic Microwave Background (CMB) via additional relativistic degrees freedom which are simultaneously generated during period T BBN CMB from long-lived sector particle. To realize phenomena we minimally extend type-I seesaw scenario Dirac fermion singlet( χ ) complex scalar singlet ( φ transform non-trivially under an unbroken symmetry Z̶ 3 . being lightest...
The fate of R-parity is one the central issues in minimal supersymmetric standard model (MSSM). Gauged $B-L$ symmetry provides a natural framework for addressing this question. Recently, it was pointed out that such theory does not need any additional Higgs if breaking achieved through VEVs right-handed sneutrinos, which ties new physics scale to MSSM. We show here immediately leads an important prediction two light sterile neutrinos, can play significant role BBN and neutrino oscillations....
We first build a minimal model of vectorlike quarks where the dominant Higgs boson production process at LHC---the gluon fusion---can be significantly suppressed, being motivated by recent stringent constraints from search for direct over wide mass range. Within this model, compatible with present experimental on searches, we demonstrate that ($h$) via heavy top-partner (${t}_{2}$) decay, $pp\ensuremath{\rightarrow}{t}_{2}{\overline{t}}_{2}$, ${t}_{2}\ensuremath{\rightarrow}th$, allows to...
The presence of R-parity violating (RPV) supersymmetric interactions involving high-energy neutrinos can lead to resonant production TeV-scale squarks inside large-volume neutrino detectors. Using the ultra-high energy events observed recently at IceCube, with fact that for a given power-law flux astrophysical neutrinos, there is no statistically significant deviation in current data from Standard Model expectations, we derive robust upper limits on RPV couplings as function...
The presence of any extra radiation energy density at the time cosmic microwave background formation can significantly impact measurement effective relativistic neutrino degrees freedom or $\mathrm{\ensuremath{\Delta}}{\mathrm{N}}_{\mathrm{eff}}$, which is very precisely measured by Planck Collaboration. Here, we propose a scenario where long-lived inert scalar, weakly coupled to dark sector, decays fermion matter via ``freeze-in'' mechanism plus standard model neutrinos low temperature...
A bstract We investigate the dynamics of electroweak phase transition within an extended Standard Model framework that includes one real scalar (Φ) and complex ( S ), both which are SM gauge singlets. The global U(1) symmetry is softly broken to a $$ {\mathcal{Z}}_3 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>Z</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:math> by 3 term in potential. After this breaking, imaginary component ) acts as pseudo-Nambu-Goldstone...
Recently Georgi has discussed the possible existence of ‘Unparticles’ describable by operators having non-integral scaling dimensions. With interaction these with Standard Model particles being constrained only gauge and Lorentz symmetries, it affords a new source for lepton flavour violation. Current future muon decay experiments are shown to be very sensitive such scenarios.
We study the phenomenology of a keV sterile neutrino in supersymmetric model with U(1) R -lepton number light very recent observation an X-ray line signal at around 3.5 keV, detected spectra Andromeda galaxy and various clusters including Perseus cluster. This not only provides small tree level mass to one active neutrinos but also renders suitable warm dark matter candidate form negligible active-sterile mixing. Light masses mixing can be explained once one-loop radiative corrections are...
The Fermi Large Area Telescope observed an excess in gamma-ray emission spectrum coming from the center of Milky Way galaxy. This data reveals that a light dark matter (DM) candidate mass range 31–40 GeV, dominantly decaying into b final state, can explain presence bump photon energy. We try to interpret this phenomena by sneutrino DM annihilation pair fermions Supersymmetric Inverse Seesaw Model (SISM). model also account for tiny non-zero neutrino masses satisfying existing oscillation...
Within the $ν$MSSM, a Minimal Supersymmetric neutrino See-saw Model, Lepton Flavour Violating Higgs couplings are strongly enhanced at large $\tanβ$ ($\gsim30$), which can lead to BR$(H^0/A^0 \to τμ) \simeq O(10^{-4})$, for $M_{H^0/A^0}\gsim 160$ GeV. Enhancements on production of bosons, through gluon fusion mechanism, $gg\to H^0/A^0$, and associated channel $gg,q\bar q\to b\bar bH^0/A^0$, whose rates grow with $\tanβ$, as well mass degeneracy that occurs between $H^0$ $A^0$ states in this...
We investigate how far a new physics scenario affecting primarily the third-generation fermions can ameliorate tension between $B$ decay observables and Standard Model expectations. Adopting model-independent approach, we find that among three show signs of such tension, viz., branching fractions for ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\tau}\ensuremath{\nu}$, ${B}_{d}\ensuremath{\rightarrow}D({D}^{*})\ensuremath{\tau}\ensuremath{\nu}$, like-sign dimuon anomaly in neutral decays,...
Considering the recent experimental results on exclusive semileptonic $B$ meson decays showing sizable departure from their Standard Model prediction of lepton flavor universality and keeping ongoing proposed non-standard Higgs searches in mind, we explore charged current observables ($\mathcal{R}_{D^{(*)}}$, $\mathcal{R}_{J/\psi}$), among other $b\to c\ell \nu$ transitions, presence a relevant scalar effective new physics operator. We use $B_c$ lifetime predicted bounds branching fraction...
We suggest searching for the charged Higgs boson at Large Hadron Collider (LHC) via $cg\ensuremath{\rightarrow}b{H}^{+}\ensuremath{\rightarrow}bt\overline{b}$. In general two doublet model, extra top Yukawa couplings ${\ensuremath{\rho}}_{tc}$ and ${\ensuremath{\rho}}_{tt}$ can drive disappearance of antimatter from Universe, while $\overline{c}b{H}^{+}$ $\overline{t}b{H}^{+}$ couple with strength ${\ensuremath{\rho}}_{tc}{V}_{tb}$ ${\ensuremath{\rho}}_{tt}{V}_{tb}$, respectively. For...
The existence of prolonged radiation domination prior to the Big Bang Nucleosynthesis (BBN), starting just after inflationary epoch, is not yet established unanimously. If instead, universe undergoes a non-standard cosmological phase, it will alter Hubble expansion rate significantly and may also generate substantial entropy through non-adiabatic evolution. This leads thumping impact on properties relic species decoupled from thermal bath before revival standard in vicinity BBN. In this...