A5007910787- 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
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Geophysics and Gravity Measurements
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Gamma-ray bursts and supernovae
- Advanced Data Storage Technologies
- advanced mathematical theories
- Nuclear physics research studies
- Astrophysical Phenomena and Observations
- Particle accelerators and beam dynamics
- Seismic Waves and Analysis
University of Oklahoma
2016-2025
University of Massachusetts Amherst
2019-2024
Centre National de la Recherche Scientifique
2010-2024
Aix-Marseille Université
2019-2024
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
2024
Centre de physique des particules de Marseille
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2020
Rice University
2017
John Brown University
2017
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 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...
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.
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...
We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at PEP-II asymmetric Factory SLAC. This result uses additional sample Upsilon(4S) collected 2001, bringing data available to 32 x 10(6) BB macro pairs. select events which one meson is fully reconstructed a final state containing charmonium and flavor other determined from its decay products. The amplitude asymmetry, standard model proportional sin2 beta, derived time...
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...
Detailed measurements of the electron performance ATLAS detector at LHC are reported, using decays Z, W and J/psi particles. Data collected in 2010 sqrt(s)=7 TeV used, corresponding to an integrated luminosity almost 40 pb^-1. The inter-alignment inner electromagnetic calorimeter, determination energy scale resolution, terms response uniformity linearity discussed. identification, reconstruction trigger efficiencies, as well charge misidentification probability, also presented.
The large rate of multiple simultaneous proton--proton interactions, or pile-up, generated by the Large Hadron Collider in Run 1 required development many new techniques to mitigate adverse effects these conditions. This paper describes methods employed ATLAS experiment correct for impact pile-up on jet energy and shapes, presence spurious additional jets, with a primary focus 20.3 fb$^{-1}$ data sample collected at centre-of-mass $\sqrt{s} = 8$ TeV. correction that incorporate sophisticated...
A search for squarks and gluinos in final states containing jets, missing transverse momentum no electrons or muons is presented. The data were recorded by the ATLAS experiment s=7TeV proton–proton collisions at Large Hadron Collider. No excess above Standard Model background expectation was observed 35pb−1 of analysed data. Gluino masses below 500 GeV are excluded 95% confidence level simplified models only first two generations, a gluino octet massless neutralino. exclusion increases to...
Proton–proton collisions at $\sqrt{s}=7$ TeV and heavy ion $\sqrt{s_{NN}}=2.76$ were produced by the LHC recorded using ATLAS experiment’s trigger system in 2010. The is designed with a maximum bunch crossing rate of 40 MHz to record approximately 200 these per second. selects events rapidly identifying signatures muon, electron, photon, tau lepton, jet, B meson candidates, as well global event signatures, such missing transverse energy. An overview system, evolution during 2010 performance...