Sumit Ghosh
A5019770383- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Radiation Detection and Scintillator Technologies
- Solar and Space Plasma Dynamics
- Quantum and electron transport phenomena
- Distributed and Parallel Computing Systems
- Astronomical Observations and Instrumentation
- Digital literacy in education
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Black Holes and Theoretical Physics
- Quantum many-body systems
- Quantum Computing Algorithms and Architecture
- Noncommutative and Quantum Gravity Theories
- Random lasers and scattering media
Korea Institute for Advanced Study
2023-2024
Mitchell Institute
2018-2023
Texas A&M University
2018-2023
Abstract High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along beam collision axis, outside acceptance existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from ATLAS interaction point and shielded by concrete rock, will host suite experiments probe standard model (SM) processes search for physics beyond (BSM). In this report, we review status civil engineering plans explore...
We consider a simple extension of the Standard Model (SM) by complex scalar doublet and singlet along with three sterile neutrinos. The neutrinos mix SM to produce light neutrino states consistent oscillation data heavy states. lightest has lifetime longer than age Universe can provide correct dark matter relic abundance. Utilizing tree-level flavor changing interactions mass $\ensuremath{\sim}\mathcal{O}(100)\text{ }\text{ }\mathrm{MeV}$ neutrinos, we explain anomalous magnetic moments both...
We show that the excess in electron recoil events seen by XENON1T experiment can be explained a relatively low-mass luminous dark matter candidate. The scatters inelastically detector (or surrounding rock) to produce heavier state with ∼2-3 keV mass splitting. This then decays within detector, producing peak spectrum is good fit observed excess. comment on ability of future direct detection experiments differentiate this model from other "beyond standard model" scenarios and possible tritium...
Light non-relativistic components of the galactic dark matter halo elude direct detection constraints because they lack kinetic energy to create an observable recoil. However, cosmic-rays can upscatter significant energies, giving experiments access previously unreachable regions parameter-space at very low mass. In this work we extend cosmic-ray formalism models inelastic and show that inaccessible mass-splitting parameter space be probed. Conventional is limited mass splittings...
The search for particle-like dark matter with meV-to-GeV masses has developed rapidly in the past few years. We summarize science case these searches, recent progress, and exciting upcoming opportunities. Funding Research Development a portfolio of small projects will allow community to capitalize on substantial advances theory experiment probe vast regions unexplored dark-matter parameter space coming decade.
The most recent measurement of the fine structure constant leads to a $2.4\ensuremath{\sigma}$ deviation in electron anomalous magnetic moment ${g}_{e}\ensuremath{-}2$, while muon ${g}_{\ensuremath{\mu}}\ensuremath{-}2$ has long-standing $3.7\ensuremath{\sigma}$ opposite direction. We show that these deviations can be explained three-loop neutrino mass model based on an ${E}_{6}$ Grand Unified Theory. also study impact such have events observed by ANITA experiment and find insufficient...
We consider searches for the inelastic scattering of low-mass dark matter at direct detection experiments, using Migdal effect. find that there are degeneracies between mass and splitting difficult to break. Using XENON1T data we set bounds on a previously unexplored region parameter space. For case exothermic scattering, effect allows xenon-based detectors have sensitivity with ${\cal O}(\mathrm{MeV})$ mass, far beyond what can be obtained nuclear recoils alone.
We propose an extension of the Standard Model gauge symmetry by group $U(1)_{T3R}$ in order to address Yukawa coupling hierarchy between third generation fermions and first two SM. assume that only right-handed generations are charged under $U(1)_{T3R}$. In addition new dark boson, we have a scalar particle whose vacuum expectation value (vev) breaks down $Z_2$ also explains problem. A vev $\cal O$(GeV) is required explain mass parameters light flavor sector naturally. The matter (DM)...
A bstract Compared to other neutrino sources, the huge anti-neutrino fluxes at nuclear reactor based experiments empower us derive stronger bounds on non-standard interactions of neutrinos with electrons mediated by light scalar/vector mediators. At energy around 200 keV flux is least an order magnitude larger compared solar flux. The atomic and crystal form factors detector materials related details structure becomes relevant this scale as momentum transfers would be small. Non-standard...
A bstract We consider gravitational sound wave signals produced by a first-order phase transition in theory with generic renormalizable thermal effective potential of power law form. find the frequency and amplitude signal can be related straightforward manner to parameters potential. This leads general conclusion; if mass dark Higgs is less than 1% vacuum expectation value, then will unobservable at all upcoming planned observatories. Although understanding production cosmological...
A bstract We investigate the effect on neutrino oscillations generated by beyond-the-standard-model interactions between neutrinos and matter. Specifically, we focus scalar-mediated non-standard (NSI) whose impact fundamentally differs from that of vector-mediated NSI. Scalar NSI contribute as corrections to mass matrix rather than matter potential thereby predict distinct phenomenology ones. Similar vector-type NSI, presence can influence measurements oscillation parameters in long-baseline...
We consider strategies for using new datasets to probe scenarios in which light right-handed SM fermions couple a gauge group, $U(1)_{T3R}$. This scenario provides natural explanation the flavor sector scale, and motivation sub-GeV dark matter. There is parameter space currently allowed, but we find that much of it can be probed with future experiments. In particular, cosmological astrophysical observations, neutrino experiments search displaced visible decay or invisible all play role....
A bstract Searches for new low-mass matter and mediator particles have actively been pursued at fixed target experiments e + − colliders. It is challenging the CERN LHC, but they searched in Higgs boson decays B meson by ATLAS CMS Collaborations, as well a low transverse momentum phenomena from forward scattering processes (e.g., FASER). We propose search scalar particle association with heavy vector-like quark. consider scenario which top quark ( t ) couples to light ϕ′ T . examine single...
The XENONnT experiment searches for weakly-interacting massive particle (WIMP) dark matter scattering off a xenon nucleus. In particular, uses dual-phase time projection chamber with 5.9-tonne liquid target, detecting both scintillation and ionization signals to reconstruct the energy, position, type of recoil. A blind search nuclear recoil WIMPs an exposure 1.1 tonne-years yielded no signal excess over background expectations, from which competitive exclusion limits were derived on...
We consider the effect on early Universe cosmology of dark photon associated with gauging $U(1{)}_{T3R}$, a symmetry group under which only right-handed Standard Model fermions transform nontrivially. find that cosmological constraints this scenario are qualitatively much more severe than other well-studied cases new $U(1)$ gauge group, because couples to chiral fermions. In particular, $U(1{)}_{T3R}$ is always produced and equilibrates in Universe, no matter how small coupling, unless...
We propose an $SU(3)_C\times SU(2)_L \times SU(2)_N U(1)_Y$ model arising from $E_6$ grand unified theory. show that the tiny neutrino masses in this can be generated at three-loop involving $SU(2)_N$ gauge bosons. With Yukawa couplings around 0.01 or larger and TeV-scale bosons, we oscillation data explained naturally by presenting a concrete benchmark set of input parameters. All new particles are TeV scale. Thus our tested ongoing/future collider experiments.
Scenarios in which right-handed light Standard Model fermions couple to a new gauge group, $U(1{)}_{T3R}$, can naturally generate sub-GeV dark matter candidate. But such models necessarily have large couplings the Model, generally yielding tight experimental constraints. We show that contributions ${g}_{\ensuremath{\mu}}\ensuremath{-}2$ from photon and Higgs largely cancel out narrow window where all constraints are satisfied, leaving net correction is consistent with recent measurements...
We investigate the effect on neutrino oscillations generated by beyond-the-standard-model interactions between neutrinos and matter. Specifically, we focus scalar-mediated non-standard (NSI) whose impact fundamentally differs from that of vector-mediated NSI. Scalar NSI contribute as corrections to mass matrix rather than matter potential thereby predict distinct phenomenology ones. Similar vector-type NSI, presence can influence measurements oscillation parameters in long-baseline...
We search for dark matter (DM) with a mass [3,12] $\mathrm{GeV} / c^2$ using an exposure of 3.51 $\mathrm{t} \times \mathrm{y}$ the XENONnT experiment. consider spin-independent, spin-dependent, momentum-dependent, mirror DM, and self-interacting DM light mediator coupling to Standard Model particles. Using lowered energy threshold compared previous WIMP search, blind analysis [0.5, 5.0] $\mathrm{keV}$ nuclear recoil events reveals no significant signal excess over background. excludes...
We report on a blinded search for dark matter with single- and few-electron signals in the first science run of XENONnT relying novel detector response framework that is physics-model-dependent. derive 90\% confidence upper limits matter-electron interactions. Heavy light mediator cases are considered standard halo model up-scattered Sun. set stringent new scattering via heavy mass within 10-20\,MeV/$c^2$ electron absorption axion-like particles photons $m_\chi$ below 0.186\,keV/$c^2$.
Characterizing low-energy (O(1keV)) nuclear recoils near the detector threshold is one of major challenges for large direct dark matter detectors. To that end, we have successfully used a Yttrium-Beryllium photoneutron source emits 152 keV neutrons calibration light and charge yields XENONnT experiment first time. After data selection, accumulated 474 events from 183 hours exposure with this source. The expected background was $55 \pm 12$ accidental coincidence events, estimated using...