A5049046725- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Neutrino Physics Research
- Particle Detector Development and Performance
- Infection Control and Ventilation
- Distributed and Parallel Computing Systems
- Quantum chaos and dynamical systems
- Thermal Regulation in Medicine
- Atomic and Subatomic Physics Research
- Scientific Computing and Data Management
- Theoretical and Computational Physics
- Science, Research, and Medicine
- Innovation Policy and R&D
- Interdisciplinary Research and Collaboration
- Climate Change and Health Impacts
- Particle Accelerators and Free-Electron Lasers
- Quantum many-body systems
- Spectroscopy and Quantum Chemical Studies
- COVID-19 and healthcare impacts
- Scientific Research and Discoveries
Wayne State University
2016-2024
Wayne State College
2018
University of Michigan–Ann Arbor
2013-2016
Indian Institute of Technology Bombay
2009-2013
Fermi National Accelerator Laboratory
2006-2012
University of Chicago
2006-2009
Argonne National Laboratory
2006-2009
George Mason University
1999-2001
A bstract We consider the possibility of a Standard Model (SM)-like Higgs in context Minimal Supersymmetric (MSSM), with mass about 125 GeV and production times decay rate into two photons which is similar or somewhat larger than SM one. The relatively large value SM-like demands stops several hundred range mixing, hierarchy between stop masses case that one light. find that, general, if heaviest smaller few TeV, gluon fusion bosons decaying tends to be suppressed respect this region...
In models with an extended Higgs sector there exists alignment limit, in which the lightest CP-even boson mimics Standard Model Higgs. The limit is commonly associated decoupling where all non-standard scalars are significantly heavier than $Z$ boson. However, can occur irrespective of mass scale rest sector. this work we discuss general conditions that lead to "alignment without decoupling", therefore allowing for existence additional bosons at weak scale. values $\tan\beta$ happens derived...
We compute the Coleman-Weinberg effective potential for Higgs field in Randall-Sundrum Gauge-Higgs unification scenarios based on a bulk $SO(5)\ifmmode\times\else\texttimes\fi{}U(1{)}_{X}$ gauge symmetry, with and fermion fields propagating custodial symmetry protecting generation of large corrections to $T$ parameter coupling $Z$ bottom quark. demonstrate that electroweak breaking may be realized, proper top- bottom-quark masses same region mass parameters lead good agreement precision data...
A bstract Recently, an excess of events consistent with a Higgs boson mass about 125 GeV was reported by the CMS and ATLAS experiments. This is values that may be obtained in minimal supersymmetric extensions Standard Model (SM), both stop masses less than TeV large mixing. The apparently enhanced photon production rate associated this potential signal result light staus Large stau mixing coupling to SM-like for tan β moderate Higgsino parameter, μ . We study phenomenological properties...
We explore models for the GeV Galactic Center excess (GCE) observed by Fermi Telescope, focusing on $\ensuremath{\chi}\ensuremath{\chi}\ensuremath{\rightarrow}f\overline{f}$ annihilation processes in ${Z}_{3}$ next-to-minimal supersymmetric standard model (NMSSM). begin examining requirements a simplified [parametrized couplings and masses of dark matter (DM) mediator particles] to reproduce GCE via $\ensuremath{\chi}\ensuremath{\chi}\ensuremath{\rightarrow}f\overline{f}$, while...
A new measurement of the muon anomalous magnetic moment has been reported by Fermilab Muon g-2 collaboration and shows a $4.2\sigma$ departure from most precise reliable calculation this quantity in Standard Model. Assuming that discrepancy is due to physics, we concentrate on simple supersymmetric model also provides dark matter explanation previously unexplored region parameter space. Such interesting can realize Bino-like candidate compatible with all current direct detection constraints...
A bstract We study the minimal supersymmetric standard model (MSSM) with flavor violation (MFV), imposing constraints from physics observables and MSSM Higgs searches, in light of recent discovery a 125 GeV boson by ATLAS CMS. analyze electroweak vacuum stability conditions to further restrict parameter space. In addition, connection ultraviolet is shown via an implementation renormalization group running, which determines TeV-scale spectrum small set supergravity parameters. Finally, we...
Current Higgs data at the Large Hadron Collider is compatible with a SM signal 2$\sigma$ level, but central value of strength in diphoton channel enhanced respect to expectation. If enhancement resides partial decay width, could be accommodated Minimally Supersymmetric Standard Model (MSSM) highly mixed light staus. We revisit issue vacuum instability induced by large mixing stau sector, including effects radiatively-corrected tau Yukawa coupling. Further, we emphasize importance taking into...
Precision measurements of the Higgs boson properties at LHC provide relevant constraints on possible weak-scale extensions Standard Model (SM). In context minimal supersymmetric (MSSM) these seem to suggest that all additional, non-SM-like bosons should be heavy, with masses larger than about 400 GeV. This article shows such results do not hold when theory approaches conditions for ``alignment independent decoupling,'' where lightest $CP$-even has SM-like tree-level couplings fermions and...
The next-to-minimal supersymmetric extension of the Standard Model (NMSSM) with a Higgs boson mass 125 GeV can be compatible stop masses order electroweak scale, thereby reducing degree fine-tuning necessary to achieve symmetry breaking. Moreover, in an attractive region NMSSM parameter space, corresponding ``alignment limit'' which one neutral fields lies approximately same direction field space as doublet vacuum expectation value, observed is predicted have Standard-Model--like properties....
We investigate a simplified model of dark matter where Majorana fermion $\chi$ coannihilates with colored scalar top partner $\tilde{t}$. explore the cosmological history, particular emphasis on most relevant low-energy parameters: mass splitting between and coannihilator, Yukawa coupling $y_\chi$ that connects these fields to Standard Model quarks. also allow free quartic $\lambda_h$ pair Higgs bosons $\tilde{t}$ pairs. pay special attention case values take those expected corresponds...
We compute the couplings of zero modes and first excited states gluons, $W$'s, $Z$ gauge bosons, as well Higgs, to third generation quarks, in a Randall-Sundrum Gauge-Higgs unification scenario based on bulk $SO(5)\ifmmode\times\else\texttimes\fi{}U(1{)}_{X}$ symmetry, with fermion fields propagating bulk. Using parameter space consistent electroweak precision tests radiative symmetry breaking, we study numerically dependence these parameters our model. Furthermore, after emphasizing...
We analyze the stability of vacuum and electroweak phase transition in NMSSM close to Peccei-Quinn symmetry limit. This limit contains light dark matter (DM) particles with a mass significantly smaller than weak scale also $CP$-even $CP$-odd Higgs bosons. Such lead consistent relic density facilitate large spin-independent direct DM detection cross section, that may accommodate recently reported signatures at DAMA CoGeNT experiments. Studying one-loop effective potential finite temperature,...
We consider search strategies for an extended Higgs sector at the high-luminosity LHC14 utilizing multitop final states. In framework of a two doublet model, purely top states ($t\overline{t}$, $4t$) are important channels heavy bosons with masses in wedge above $2{m}_{t}$ and low values $\mathrm{tan}\ensuremath{\beta}$, while $2b2t$ state is most relevant moderate $\mathrm{tan}\ensuremath{\beta}$. find, $t\overline{t}H$ channel, $H\ensuremath{\rightarrow}t\overline{t}$, that both single...
A bstract Electroweak baryogenesis is an attractive mechanism to generate the baryon asymmetry of Universe via a strong first order electroweak phase transition. We compare transition patterns suggested by vacuum structure at critical temperatures , which local minima are degenerate, with those obtained from computing probability for nucleation tunneling through barrier separating minima. Heuristically, becomes difficult if between too high, or distance (in field space) large. As example...
A bstract We analyze a low energy effective model of Dark Matter in which the thermal relic density is provided by singlet Majorana fermion interacts with Higgs fields via higher dimensional operators. Direct detection signatures may be reduced if blind spot solutions exist, naturally appear models extended sectors. Explicit mass terms for can forbidden Z 3 symmetry, addition leads to reduction number Moreover, weak scale obtained from vacuum expectation value scalar field. The proper s...
A bstract The ATLAS and CMS experiments have recently announced the discovery of a Higgs-like resonance with mass close to 125 GeV. Overall, data is consistent Standard Model (SM)-like Higgs boson. Such particle may arise in minimal super-symmetric extension SM average stop masses order TeV scale sizable mixing parameter. In this article we discuss properties SM-like production decay rates induced by possible presence light staus stops. Light can affect rate into di-photons and, case...
We study the collider phenomenology of extended Higgs sector next-to-minimal supersymmetric Standard Model (NMSSM). The region NMSSM parameter space favored by a 125 GeV SM-like and naturalness generically features light neutralino spectrum as well large $\mathcal{O}(1)$ coupling between doublets singlet fields. In such regimes, heavier bosons can decay dominantly into lighter neutralinos. prospects observing decays at 13 TeV LHC, focusing on mono-Higgs signatures probes regions space....
A bstract The Next-to-Minimal Supersymmetric Standard Model (NMSSM), the singlet extension of MSSM which fixes many MSSM’s shortcomings, is shown to be within reach upcoming runs Large Hadron Collider (LHC). systematic treatment various Higgs decay channels and their interplay has been lacking due seemingly large number free parameters in NMSSM’s sector. We demonstrate that SM-like nature observed boson, neutralino sectors have highly correlated masses couplings can effectively described by...
Gauge Higgs Unification in Warped Extra Dimensions provides an attractive solution to the hierarchy problem. The extension of Standard Model gauge symmetry $SO(5)xU(1)_X$ allows incorporation custodial $SU(2)_R$ plus a boson doublet with right quantum numbers under group. In minimal model, mass is range 110-150 GeV, while light Kaluza Klein (KK) excitation top quark appears spectrum, providing agreement precision electroweak measurements and possible test model at high luminosity LHC. lepton...
Current analyses of the LHC data put stringent bounds on strongly interacting supersymmetric particles, restricting masses squarks and gluinos to be above TeV scale. However, electroweak sector is poorly constrained. In this article we explore consistency possible missing energy signals with broader phenomenological structure in low supersymmetry models. As an example, focus newly developed recursive jigsaw reconstruction analysis by ATLAS, which reports interesting event excesses channels...
A bstract We show that simultaneously explaining dark matter and the observed value of muon’s magnetic dipole moment may lead to yet unexplored photon signals at LHC. consider Minimal Supersymmetric Standard Model with electroweakino masses in few-to-several hundred GeV range, opposite sign Bino mass parameter respect both Higgsino Wino parameters. In such region space, spin-independent elastic scattering cross section a Bino-like candidate direct detection experiment is suppressed by...