Roshan Mammen Abraham
A5015171790- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Solar and Space Plasma Dynamics
- Radiation Therapy and Dosimetry
- HIV, Drug Use, Sexual Risk
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Scientific Computing and Data Management
- Engineering Education and Pedagogy
- Scientific Research and Discoveries
- Indigenous Health, Education, and Rights
- Migration, Health and Trauma
- Graphite, nuclear technology, radiation studies
- Interpreting and Communication in Healthcare
- Migration, Refugees, and Integration
- Migration and Labor Dynamics
Oklahoma State University Oklahoma City
2021-2025
University of California, Irvine
2024
Oklahoma State University
2020-2023
Polytechnic University
2020
Case Western Reserve University
2018-2019
The Forward Physics Facility (FPF) is a proposal to create cavern with the space and infrastructure support suite of far-forward experiments at Large Hadron Collider during High Luminosity era. Located along beam collision axis shielded from interaction point by least 100 m concrete rock, FPF will house that detect particles outside acceptance existing large LHC observe rare exotic processes in an extremely low-background environment. In this work, we summarize current status plans for FPF,...
The LHC produces an intense beam of highly energetic neutrinos all three flavors in the forward direction, and Forward Physics Facility (FPF) has been proposed to house a suite experiments taking advantage this opportunity. In study, we investigate FPF’s potential probe neutrino electromagnetic properties, including millicharge, magnetic moment, charge radius. We find that, due large flux tau at LHC, FPF detectors will be able provide more sensitive constraints on moment millicharge than...
A bstract The first FASER search for a light, long-lived particle decaying into pair of photons is reported. uses LHC proton-proton collision data at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 . 6 TeV collected in 2022 and 2023, corresponding to an integrated luminosity 57 7 fb − 1 model with axion-like particles (ALPs) dominantly coupled weak gauge bosons the primary target. Signal events are...
A bstract Proton-proton collisions at energy-frontier facilities produce an intense flux of high-energy light particles, including neutrinos, in the forward direction. At LHC, these particles are currently being studied with far-forward experiments FASER/FASER ν and SND@LHC, while new dedicated have been proposed context a Forward Physics Facility (FPF) operating HL-LHC. Here we present first quantitative exploration reach for neutrino, QCD, BSM physics integrated within Future Circular...
The significant neutrino flux at high rapidity the LHC motivates dedicated forward detectors to study properties of neutrinos TeV energies. We investigate magnetic dipole interactions between active and new sterile states emulsion liquid argon experiments that could be located in a future Forward Physics Facility (FPF) downstream ATLAS interaction point. up-scattering off electrons produces an electron recoil signature can probe regions parameter space High Luminosity (HL-LHC), particularly...
Tau neutrinos are the least studied particle in Standard Model. This whitepaper discusses current and expected upcoming status of tau neutrino physics with attention to broad experimental theoretical landscape spanning long-baseline, beam-dump, collider, astrophysical experiments. was prepared as a part NuTau2021 Workshop.
The first results of the study high-energy electron neutrino (ν_{e}) and muon (ν_{μ}) charged-current interactions in FASERν emulsion-tungsten detector FASER experiment at LHC are presented. A 128.8 kg subset volume was analyzed after exposure to 9.5 fb^{-1} sqrt[s]=13.6 TeV pp data. Four (eight) ν_{e} interaction candidate events observed with a statistical significance 5.2σ (5.7σ). This is direct observation particle collider includes highest-energy ν_{μ} ever detected from an artificial...
In detecting neutrinos from the Large Hadron Collider, $\mathrm{FASER}\ensuremath{\nu}$ will record most energetic laboratory ever studied. While charged current neutrino scattering events can be cleanly identified by an lepton exiting interaction vertex, neutral interactions are more difficult to detect. We explore potential of observe $\ensuremath{\nu}N\ensuremath{\rightarrow}\ensuremath{\nu}N$, demonstrating techniques discriminate hadron backgrounds as well estimate incoming energy given...
Models with light dark sector and matter particles motivate qualitatively new collider searches. Here we carry out a comprehensive study of hadrophilic models ${\mathrm{U}(1)}_{B}$ ${\mathrm{U}(1)}_{B\ensuremath{-}3{L}_{\ensuremath{\tau}}}$ gauge bosons coupled to matter. The mediator in these couple quarks, but have suppressed couplings leptons, providing useful foil the well-studied photon models. We consider current bounds from accelerator searches, rare anomaly-induced decays, neutrino...
This paper presents the first results of study high-energy electron and muon neutrino charged-current interactions in FASER$\nu$ emulsion/tungsten detector FASER experiment at LHC. A subset volume, which corresponds to a target mass 128.6~kg, was exposed neutrinos from LHC $pp$ collisions with centre-of-mass energy 13.6~TeV an integrated luminosity 9.5 fb$^{-1}$. Applying stringent selections requiring electrons reconstructed above 200~GeV, four interaction candidate events are observed...
The Forward Search Experiment (FASER) at CERN’s Large Hadron Collider (LHC) has recently directly detected the first collider neutrinos. Neutrinos play an important role in all FASER analyses, either as signal or background, and it is therefore essential to understand neutrino event rates. In this study, we update previous simulations present prescriptions for theoretical predictions of fluxes cross sections, together with their associated uncertainties. With these results, discuss potential...
The FASER experiment was designed to study long-lived dark sector particles and neutrinos traveling in the forward direction at LHC. Neutrinos are predominantly produced from meson decays, which also result an intense energetic flux of muons regularly observed by FASER. So far, these treated only as backgrounds neutrino new physics studies, extensive effort is required suppress them. In this study, we consider opposite scenario use produce muonphilic scalars, can then be searched for...
This Letter presents the measurement of energy-dependent neutrino-nucleon cross section in tungsten and differential flux muon neutrinos antineutrinos. The analysis is performed using proton-proton collision data at a center-of-mass energy 13.6 TeV corresponding to an integrated luminosity <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mn>65.6</a:mn><a:mo>±</a:mo><a:mn>1.4</a:mn><a:mo stretchy="false">)</a:mo><a:mtext>...
Abstract The angular moments of the Z boson can be used as analyzers for underlying production dynamics $$t{{\bar{t}}} Z$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>Z</mml:mi> </mml:math> and tZj processes. In this manuscript, we derive these at leading next-to-leading order in QCD LHC. We show that observables work efficient probes to beyond Standard Model effects, considering...
Macroscopic dark matter (aka macros) constitutes a broad class of alternatives to particulate matter. We calculate the luminosity produced by passage single macro as function its physical cross section. A general detection scheme is developed for measuring fluorescence caused passing in atmosphere that applicable any ground based or space Fluorescence Detecting (FD) telescopes. In particular, we employ this constrain parameter (σx vs Mx) macros than can be probed Pierre Auger Observatory and...
The LHC produces an intense beam of highly energetic neutrinos all three flavors in the forward direction, and Forward Physics Facility (FPF) has been proposed to house a suite experiments taking advantage this opportunity. In study, we investigate FPF's potential probe neutrino electromagnetic properties, including millicharge, magnetic moment, charge radius. We find that, due large flux tau at LHC, FPF detectors will be able provide strongest laboratory-based sensitivity moment millicharge...
We explore the sensitivity to new physics for coupling of Higgs boson ($h$) and top quark ($t$) at high energy scales with process $pp\to t\bar{t}h$ high-luminosity LHC. This probes in both space-like time-like domains a scale, complementary off-shell processes domain. The effects from beyond Standard Model are parametrized terms effective field theory framework non-local Higgs-top form factor. Focusing on boosted regime association jet substructure techniques, we show that present search...
Recently a remarkable relation has been demonstrated between the observed radial acceleration in disk galaxies and predicted on basis of baryonic matter alone. Here we study this within framework modified gravity model MOND. The field equations MOND automatically imply (RAR) for spherically symmetric galaxies, but deviations from are expected. investigate whether these sufficient magnitude to bring into conflict with relation. In quasilinear formulation MOND, calculate gravitational given...
The LHC may produce light, weakly-interacting particles that decay to dark matter, creating an intense and highly collimated beam of matter in the far-forward direction. We investigate prospects for detecting this two detectors proposed a future Forward Physics Facility: FASER$\nu$2, 10-tonne emulsion detector, FLArE, 10- 100-tonne LArTPC. focus here on nuclear scattering, including elastic resonant pion production, deep inelastic devise cuts efficiently remove neutrino-induced background....
Proton-proton collisions at energy-frontier facilities produce an intense flux of high-energy light particles, including neutrinos, in the forward direction. At LHC, these particles are currently being studied with far-forward experiments FASER/FASER$\nu$ and SND@LHC, while new dedicated have been proposed context a Forward Physics Facility (FPF) operating HL-LHC. Here we present first quantitative exploration reach for neutrino, QCD, BSM physics integrated within Future Circular Collider...
The first FASER search for a light, long-lived particle decaying into pair of photons is reported. uses LHC proton-proton collision data at $\sqrt{s}=13.6~\text{TeV}$ collected in 2022 and 2023, corresponding to an integrated luminosity $57.7\text{fb}^{-1}$. A model with axion-like particles (ALPs) dominantly coupled weak gauge bosons the primary target. Signal events are characterised by high-energy deposits electromagnetic calorimeter no signal veto scintillators. One event observed,...
This letter presents the measurement of energy-dependent neutrino-nucleon cross section in tungsten and differential flux muon neutrinos anti-neutrinos. The analysis is performed using proton-proton collision data at a center-of-mass energy $13.6 \, {\rm TeV}$ corresponding to an integrated luminosity $(65.6 \pm 1.4) \mathrm{fb^{-1}}$. Using active electronic components FASER detector, $338.1 21.0$ charged current neutrino interaction events are identified, with backgrounds from other...