A5105529068- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- advanced mathematical theories
- Muon and positron interactions and applications
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Semiconductor Lasers and Optical Devices
- Nuclear Physics and Applications
- Semiconductor Quantum Structures and Devices
- Advanced Optical Sensing Technologies
- Nuclear reactor physics and engineering
- Quantum, superfluid, helium dynamics
- Radiation Effects in Electronics
University of Oxford
2015-2024
Science Oxford
2020-2024
Institute for Nuclear Research
2020-2023
Institute of Nuclear Physics, Polish Academy of Sciences
2012-2022
European Organization for Nuclear Research
2010-2022
Oklahoma State University
2008-2020
Uppsala University
2014-2015
Universidad Nacional de La Plata
2015
Michigan State University
2010-2013
Leverhulme Trust
2011
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...
We present the first results of Fermilab Muon g-2 Experiment for positive muon magnetic anomaly $a_\mu \equiv (g_\mu-2)/2$. The is determined from precision measurements two angular frequencies. Intensity variation high-energy positrons decays directly encodes difference frequency $\omega_a$ between spin-precession and cyclotron frequencies polarized muons in a storage ring. ring field measured using nuclear resonance probes calibrated terms equivalent proton spin precession...
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...
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.
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...
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...
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 jet energy scale and its systematic uncertainty are determined for jets measured with the ATLAS detector at LHC in proton-proton collision data a centre-of-mass of $\sqrt{s}=7\ \mathrm{TeV}$ corresponding to an integrated luminosity 38 pb−1. Jets reconstructed anti-k t algorithm distance parameters R=0.4 or R=0.6. Jet angle corrections from Monte Carlo simulations calibrate transverse momenta p T≥20 GeV pseudorapidities |η|<4.5. is estimated using single isolated hadron response situ...
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.
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...
Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by presence two leptons (electrons muons) missing transverse momentum are performed using 20.3 fb-1 proton-proton collision data at sqrt(s) = 8 TeV recorded with ATLAS experiment Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits set on masses lightest chargino, next-to-lightest neutralino different lightest-neutralino mass hypotheses...
This paper describes a measurement of the $Z/\gamma^*$ boson transverse momentum spectrum using ATLAS proton-proton collision data at centre-of-mass energy $\sqrt{s}$ = 7 TeV LHC. The is performed in $Z/\gamma^* \rightarrow e^+e^-$ and \mu^+\mu^-$ channels, corresponding to an integrated luminosity 4.7 fb$^{-1}$. Normalized differential cross sections as function are measured for momenta up 800 GeV. inclusively rapidities 2.4, well three rapidity bins. channel results combined, compared...
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The uses 20.3 fb $${}^{-1}$$ $$\sqrt{s}=8$$ TeV data collected 2012 the ATLAS detector at LHC. Events required to have least one $$p_{\mathrm {T}}> 120$$ GeV no leptons. Nine signal regions considered increasing requirements between $$E_{\mathrm {T}}^{\mathrm {miss}}>150$$ {miss}}> 700$$ GeV. Good agreement is observed number events Standard Model expectations....
A search for squarks and gluinos in final states containing high-p T jets, missing transverse momentum no electrons or muons is presented. The data were recorded 2012 by the ATLAS experiment $$ \sqrt{s}=8 TeV proton-proton collisions at Large Hadron Collider, with a total integrated luminosity of 20.3 fb−1. Results are interpreted variety simplified specific supersymmetry-breaking models assuming that R-parity conserved lightest neutralino supersymmetric particle. An exclusion limit 95%...
A measurement of the production processes recently discovered Higgs boson is performed in two-photon final state using $4.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ proton-proton collisions data at $\sqrt{s}=7\text{ }\mathrm{TeV}$ and $20.3\text{ $\sqrt{s}=8\text{ collected by ATLAS detector Large Hadron Collider. The number observed decays to diphotons divided corresponding Standard Model prediction, called signal strength, found be...
The measurement of missing transverse momentum in the ATLAS detector, described this paper, makes use full event reconstruction and a calibration based on reconstructed physics objects. performance is evaluated using data collected pp collisions at centre-of-mass energy 7 TeV 2010. Minimum bias events with jets hadrons are used from samples corresponding to an integrated luminosity about 0.3 nb−1 600 respectively, together containing Z boson decaying two leptons (electrons or muons) W lepton...
The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector using proton–proton collision data a centre-of-mass of $$\sqrt{s}=7$$ TeV corresponding to an integrated luminosity $$4.7$$ $$\,\,\text{ fb }^{-1}$$ . Jets reconstructed from deposits forming topological clusters calorimeter cells anti- $$k_{t}$$ algorithm distance parameters $$R=0.4$$ or $$R=0.6$$ , calibrated MC simulations. A residual JES correction is applied account...