A5026053950- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Renewable energy and sustainable power systems
- Building energy efficiency and sustainability
- Particle Accelerators and Free-Electron Lasers
- Noncommutative and Quantum Gravity Theories
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Advanced X-ray Imaging Techniques
- International Science and Diplomacy
- Superconducting Materials and Applications
- Solid State Laser Technologies
- Radioactive Decay and Measurement Techniques
- Laser Design and Applications
- Chaos-based Image/Signal Encryption
Indian Institute of Technology Guwahati
2014-2024
Concordia University
2020
University of Southampton
2006-2010
Universidad Nacional Autónoma de México
2010
University of Turin
2010
Durham University
2010
Indian Institute of Science Bangalore
2001-2004
RWTH Aachen University
2002-2003
Physical Research Laboratory
1995-2000
Tata Institute of Fundamental Research
1998-2000
High energy photon colliders (γγ,γe) are based on e - linear where high photons produced using Compton scattering of laser light electrons just before the interaction point. This paper is a part Technical Design Report collider TESLA. 1 Physics program, possible parameters and some technical aspects at TESLA discussed.
In this study of the Inert Doublet Model (IDM), we propose that dijet + missing transverse energy channel at Large Hadron Collider (LHC) will be an effective way searching for scalar particles IDM. This receives contributions from gauge boson fusion, and t-channel production, along with H+ associated production. We perform analysis including Standard (SM) background assumed systematic uncertainty, optimise selection criteria employing suitable cuts on kinematic variables to maximise signal...
We explore constraints on multipartite dark matter (DM) framework composed of singlet scalar DM interacting with the Standard Model (SM) through Higgs portal coupling. compute relic density and direct search including updated LUX bound for two component scenario non-zero interactions between components in $\mathcal{Z}_2\times \mathcal{Z}_2^{'}$ comparison one having $\mathcal{O}(2)$ symmetry. point out availability a significantly large region parameter space such model DM-DM interactions.
We examine flavour-changing neutral-current decays of the top quark, t→qγ, t→qZ, t→qH, and t→qg (with q=u,c), in Alternative Left-Right Model, a left right-symmetric model featuring exotic quarks light bosons. These have very small probability occurring within Standard but they can be enhanced this through presence states. While associated signals may detected directly at LHC, rare advantage offering means to probe new particles indirectly, loop-contributions. perform comprehensive analysis...
We explore the multi-component dark matter (DM) scenario considered in a simple extension of standard model with an inert scalar doublet and singlet fermionic field providing two DM candidates. The states are made stable under unbroken $$Z_2\times Z_2'$$ discrete symmetry. An additional gauge is introduced to facilitate interaction fermion visible sector. Presence charged having same $$Z_2$$ charge as that allows exploring mass regions otherwise disallowed, like Inert Doublet Model (IDM)...
The ATLAS and CMS Collaborations have observed independently at the LHC a new Higgs-like particle with mass ${M}_{h}\ensuremath{\sim}125\text{ }\text{ }\mathrm{GeV}$ properties similar to that predicted by Standard Model (SM). Although measurements indicate this boson is compatible SM hypothesis, due large uncertainties in some of Higgs detection channels, one still has possibility testing object as being candidate for beyond physics scenarios, example, minimal supersymmetric (MSSM),...
We show how the LHC potential to detect a rather light CP-even Higgs boson of NMSSM, H1 or H2, decaying into CP-odd states, A1A1, can be improved if Higgs-strahlung off W bosons and (more marginally) top–antitop pairs are employed alongside vector fusion as production modes. Our results should help extracting at least one signal over NMSSM parameter space.
While the properties of 125 GeV Higgs bosonlike particle observed by ATLAS and CMS collaborations are largely compatible with those predicted for Standard Model state, significant deviations present in some cases. We, therefore, test viability a beyond scenario based on supersymmetry, $CP$-violating next-to-minimal supersymmetric Model, against corresponding experimental observations. Namely, we identify possible model configurations which one its bosons is consistent LHC observation...
In the next-to-minimal supersymmetric (NMS) Standard Model (SM), it is possible for either one of additional singlet-like scalar and pseudoscalar Higgs bosons to be almost degenerate in mass with $$\sim $$ $$125$$ GeV SM-like state. real NMSSM (rNMSSM), when difference between two states comparable their individual total decay widths, quantum mechanical interference, due relevant diagonal as well off-diagonal terms propagator matrix, them can become sizeable. This possibility invalidates...
We study the mass bounds of ${W}_{R}$ gauge boson in generic left-right symmetric models. Assuming that bosons couple universally to quarks and leptons, we allow different couplings ${g}_{R}\ensuremath{\ne}{g}_{L}$ mixing ${V}_{\mathrm{CKM}}^{L}\ensuremath{\ne}{V}_{\mathrm{CKM}}^{R}$ left right sectors. Imposing constraints from collider experiments ${K}^{0}$, ${B}_{d}$, ${B}_{s}$ physics, investigate scenarios where is lighter or heavier than right-handed neutrino ${\ensuremath{\nu}}_{R}$....
$\mathrm{CP}$ violation can arise in the production of top-quark--top-antiquark pair photon-photon collisions presence a nonzero electric dipole coupling top quark. This show up distribution leptons produced subsequent decay quarks. We study $\mathrm{CP}$-violating asymmetries final-state under assumption that occurs top-quark pair, neglecting decay. The defined be used to determine imaginary part form factors. A \ensuremath{\gamma}\ensuremath{\gamma} collider with photon beams generated...
In the presence of an electric dipole coupling $t\overline{t}$ to a photon, and analogous "weak" $Z$, $\mathrm{CP}$ violation in process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}t\overline{t}$ leads polarization top quark antiquark. This can be analyzed by studying energy angular distributions decay charged lepton (antilepton) when (top antiquark) decays leptonically. We have obtained analytic expressions for these either $t$ or $\overline{t}$ study two types simple...
In this work, Higgs couplings with gauge bosons is probed through $e^-e^+ \rightarrow W^-W^+H$ in an effective Lagrangian framework. An ILC of 500 $GeV$ center mass energy possible beam polarization considered for purpose. The reach integrated luminosity 300 $fb^{-1}$ the determination both CP-conserving and CP-violating parameters are obtained. Sensitivity probe each these on presence other investigated. most influential $\bar c_W=-\bar c_B$. Other significant effect c_{HW}$ c_{HB}$ among...
A study of the top quark flavor changing neutral current (FCNC) through $Z$-boson has been performed in proposed future ${e}^{\ensuremath{-}}p$ collider for energy, ${E}_{e(p)}=60(7000)\text{ }\text{ }\mathrm{GeV}$. We considered an effective theory where anomalous FCNC couplings are vector and tensor nature. The effect these is probed single production along with scattered electron. polar angle $\ensuremath{\theta}$ electrons coming out primary vertex association polarization asymmetries...
The signatures of heavy fermionic isotriplets ( $$\Sigma $$ ) are probed through their direct production and subsequent decay at high energy electron–positron colliders. Unlike the case LHC, process has strong dependence on mixing with electron $$V_{e}$$ ), making leptonic collider unique to fingerprint presence such mixing. We establish that pair considered $$\sqrt{s}=2$$ TeV can be employed study both cases $$V_e=0$$ $$V_e\ne 0$$ $$\sim 100$$ fb $$^{-1}$$ luminosity, while single probe...
We consider the issue of top quark Yukawa coupling measurement in a model dependent and general case with inclusion CP-violation coupling. Arguably best process to study this is associa ted production Higgs boson along $t\bar t$ pair machine like International Linear Collider (ILC). While detailed analyses sensitivity assuming Standard Model (SM) - are available context ILC, conclude that th e could be pinned down at about 10\% level modest luminosity, our investigations show scenario...
The recently discovered scalar resonance at the Large Hadron Collider is now almost confirmed to be a Higgs boson, whose $CP$ properties are yet established. At International Linear with and without polarized beams, it may possible probe these high precision. In this work, we study possibility of probing departures from pure $CP$-even case, by using decay distributions in process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}t\overline{t}\ensuremath{\Phi}$, $\ensuremath{\Phi}$ mainly...
The anomalous $WWγ$ coupling is probed through $eγ\rightarrow νW$ at the ILC. With a spectacular single lepton final state, this process well suited to study above coupling. Cross section measurements can probe $δκ_γ$ about $\pm 0.004$ for luminosity of 100 fb$^{-1}$ $500$ GeV center-of-mass energy with unpolarized electron beam. limits derivable on $λ_γ$ from total cross are comparatively more relaxed. Exploiting energy-angle double distribution secondary muons, kinematic regions sensitive...
We investigate the potential collider signatures of singly-charged and doubly-charged Higgs bosons such as those arising in minimal left-right symmetric models. Focusing on multileptonic probes context high-luminosity run Large Hadron Collider, we separately assess advantages four-leptonic trileptonic final states for a representative benchmark setup designed by considering large set experimental constraints. Our study establishes possibilities identifying scalars at Collider with...
We investigate the possibility of neutrinoless double beta decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) and leptogenesis within alternative left-right model (ALRM). Unlike usual symmetric model, ALRM features a Majorana right-handed neutrino which does not carry any charge. Further, in this picture down-type quark charged leptons receive mass through additional left-handed scalar field, rather than doublet. Together, these conspire to generate significant contributions...