B. S. Acharya
A5042807344- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- ZnO doping and properties
- Gamma-ray bursts and supernovae
- Distributed and Parallel Computing Systems
- Muon and positron interactions and applications
- Noncommutative and Quantum Gravity Theories
- Geometry and complex manifolds
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Radio Astronomy Observations and Technology
- Luminescence Properties of Advanced Materials
- Copper-based nanomaterials and applications
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2016-2025
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Udine
2016-2025
University of Mississippi
2023-2025
King's College London
2016-2025
The Abdus Salam International Centre for Theoretical Physics (ICTP)
2016-2025
University of Udine
2010-2025
Tata Institute of Fundamental Research
2013-2024
New York University
2024
Atlas Scientific (United States)
2024
SR Research (Canada)
2024
A search for the Standard Model Higgs boson in proton-proton collisions with ATLAS detector at LHC is presented. The datasets used correspond to integrated luminosities of approximately 4.8 fb^-1 collected sqrt(s) = 7 TeV 2011 and 5.8 8 2012. Individual searches channels H->ZZ^(*)->llll, H->gamma gamma H->WW->e nu mu data are combined previously published results H->ZZ^(*), WW^(*), bbbar tau^+tau^- from improved analyses H->ZZ^(*)->llll data. Clear evidence production a neutral measured mass...
The ATLAS detector as installed in its experimental cavern at point 1 CERN is described this paper. A brief overview of the expected performance when Large Hadron Collider begins operation also presented.
The simulation software for the ATLAS Experiment at Large Hadron Collider is being used large-scale production of events on LHC Computing Grid. This requires many components, from generators that simulate particle collisions, through packages simulating response various detectors and triggers. All these components come together under infrastructure. In this paper, infrastructure discussed, including supporting detector description, interfacing event generation, combining GEANT4 individual...
A measurement of the Higgs boson mass is presented based on combined data samples ATLAS and CMS experiments at CERN LHC in H→γγ H→ZZ→4ℓ decay channels. The results are obtained from a simultaneous fit to reconstructed invariant peaks two channels for experiments. measured masses individual found be consistent among themselves. mH=125.09±0.21 (stat)±0.11 (syst) GeV.Received 25 March 2015DOI:https://doi.org/10.1103/PhysRevLett.114.191803This article available under terms Creative Commons...
The D0 Collaboration reports on a search for the standard model top quark in pp¯ collisions at s=1.8TeV Fermilab Tevatron with an integrated luminosity of approximately 50pb−1. We have searched tt¯ production dilepton and single-lepton decay channels without tagging b-quark jets. observed 17 events expected background 3.8±0.6 events. probability upward fluctuation to produce signal is 2×10−6 (equivalent 4.6 deviations). kinematic properties excess are consistent decay. conclude that we...
Combined ATLAS and CMS measurements of the Higgs boson production decay rates, as well constraints on its couplings to vector bosons fermions, are presented. The combination is based analysis five processes, namely gluon fusion, associated with a $W$ or $Z$ pair top quarks, six modes $H \to ZZ, WW$, $\gamma\gamma, \tau\tau, bb$, $\mu\mu$. All results reported assuming value 125.09 GeV for mass, result combined measurement by experiments. uses CERN LHC proton--proton collision data recorded...
By using the ATLAS detector, observations have been made of a centrality-dependent dijet asymmetry in collisions lead ions at Large Hadron Collider. In sample lead-lead events with per-nucleon center mass energy 2.76 TeV, selected minimum bias trigger, jets are reconstructed fine-grained, longitudinally segmented electromagnetic and hadronic calorimeters. The transverse energies dijets opposite hemispheres observed to become systematically more unbalanced increasing event centrality leading...
During 2015 the ATLAS experiment recorded $$3.8\,{\mathrm{fb}}^{-1}$$ of proton–proton collision data at a centre-of-mass energy $$13\,{\mathrm{TeV}}$$ . The trigger system is crucial component experiment, responsible for selecting events interest recording rate approximately 1 kHz from up to 40 MHz collisions. This paper presents short overview changes and acquisition systems during first long shutdown LHC shows performance its components based on data.
A detailed study is presented of the expected performance ATLAS detector. The reconstruction tracks, leptons, photons, missing energy and jets investigated, together with b-tagging trigger. physics potential for a variety interesting processes, within Standard Model beyond, examined. comprises series notes based on simulations detector particular emphasis given to data from first years operation LHC at CERN.
The Cherenkov Telescope Array, CTA, will be the major global observatory for very high energy gamma-ray astronomy over next decade and beyond. scientific potential of CTA is extremely broad: from understanding role relativistic cosmic particles to search dark matter. an explorer extreme universe, probing environments immediate neighbourhood black holes voids on largest scales. Covering a huge range in photon 20 GeV 300 TeV, improve all aspects performance with respect current instruments....
This article documents the performance of ATLAS muon identification and reconstruction using first LHC dataset recorded at $\sqrt{s}$ = 13 TeV in 2015. Using a large sample $J/\psi\to\mu\mu$ $Z\to\mu\mu$ decays from 3.2 fb$^{-1}$ $pp$ collision data, measurements efficiency, as well momentum scale resolution, are presented compared to Monte Carlo simulations. The efficiency is measured be close $99\%$ over most covered phase space ($|\eta|<2.5$ $5 < p_{T} 100$ GeV). isolation varies between...
A combined search for the Standard Model Higgs boson with ATLAS experiment at LHC using datasets corresponding to integrated luminosities from 1.04 fb-1 4.9 of pp collisions collected sqrt(s) = 7 TeV is presented. The mass ranges 112.9-115.5 GeV, 131-238 GeV and 251-466 are excluded 95% confidence level (CL), while range 124-519 expected be in absence a signal. An excess events observed around mH ~ 126 local significance 3.5 standard deviations (sigma). H -> gamma gamma, ZZ(*) lll'l' WW(*)...
Two-particle correlations in relative azimuthal angle (Δø) and pseudorapidity (Δη) are measured sqrt[s(NN)] = 5.02 TeV p+Pb collisions using the ATLAS detector at LHC. The measurements performed approximately 1 μb(-1) of data as a function transverse momentum (p(T)) energy (ΣE(T)(Pb)) summed over 3.1 < η 4.9 direction Pb beam. correlation function, constructed from charged particles, exhibits long-range (2 |Δ | 5) "near-side" (Δø ~ 0) that grows rapidly with increasing ΣE(T)(Pb). A...
We report the observation of X(3872) in J/psipi(+)pi(-) channel, with J/psi decaying to mu(+)mu(-), pp collisions at sqrt[s]=1.96 TeV. Using approximately 230 pb(-1) data collected Run II D0 detector, we observe 522+/-100 candidates. The mass difference between state and is measured be 774.9+/-3.1(stat)+/-3.0(syst) MeV/c(2). have investigated production decay characteristics find them similar those psi(2S) state.
Studies of the spin and parity quantum numbers Higgs boson are presented, based on proton-proton collision data collected by ATLAS experiment at LHC. The Standard Model spin-parity JP = 0+ hypothesis is compared with alternative hypotheses using decays H->gamma gamma, H -> ZZ 4 leptons H->WW l nu nu, as well combination these channels. analysed dataset corresponds to an integrated luminosity 20.7 fb-1 a centre-of-mass energy sqrt(s) 8 TeV. For 4-lepton decay mode corresponding 4.6 7 TeV...
The luminosity calibration for the ATLAS detector at LHC during pp collisions sqrt(s) = 7 TeV in 2010 and 2011 is presented. Evaluation of scale performed using several luminosity-sensitive detectors, comparisons are made long-term stability accuracy this applied to TeV. A uncertainty Delta L/L +/- 3.5% obtained 47 pb-1 data delivered 2010, an 1.8% 5.5 fb-1 2011.
Measurements are presented from proton–proton collisions at centre-of-mass energies of , 2.36 and 7 TeV recorded with the ATLAS detector LHC. Events were collected using a single-arm minimum-bias trigger. The charged-particle multiplicity, its dependence on transverse momentum pseudorapidity relationship between mean multiplicity measured. in different regions phase space shown, providing diffraction-reduced measurements as well more inclusive ones. observed distributions corrected to...
Combined measurements of Higgs boson production cross sections and branching fractions are presented. The combination is based on the analyses decay modes $H \to \gamma\gamma$, $ZZ^\ast$, $WW^\ast$, $\tau\tau$, $b\bar{b}$, $\mu\mu$, searches for decays into invisible final states, off-shell production. Up to $79.8$ fb$^{-1}$ proton-proton collision data collected at $\sqrt{s}=$ 13 TeV with ATLAS detector used. Results presented gluon-gluon fusion vector-boson processes, associated vector...
Differential measurements of charged particle azimuthal anisotropy are presented for lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector LHC, based on an integrated luminosity approximately 8 mb^-1. This is characterized via a Fourier expansion distribution particles in angle (phi), coefficients v_n denoting magnitude anisotropy. Significant v_2-v_6 values obtained as function transverse momentum (0.5<pT<20 GeV), pseudorapidity (|eta|<2.5) and centrality using event plane...
The reconstruction of the signal from hadrons and jets emerging proton-proton collisions at Large Hadron Collider (LHC) entering ATLAS calorimeters is based on a three-dimensional topological clustering individual calorimeter cell signals. cluster formation follows signal-significance patterns generated by electromagnetic hadronic showers. In this, algorithm implicitly performs noise suppression removing cells with insignificant signals which are not in close proximity to significant...