A. V. Anisenkov
A5081964174- 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
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Scientific Computing and Data Management
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Big Data Technologies and Applications
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Muon and positron interactions and applications
- Advanced X-ray and CT Imaging
- Structural Analysis of Composite Materials
- Parallel Computing and Optimization Techniques
European Organization for Nuclear Research
2012-2025
Budker Institute of Nuclear Physics
2015-2024
Siberian Branch of the Russian Academy of Sciences
2015-2024
Novosibirsk State University
2015-2024
National Technical University of Athens
2023-2024
Columbia University
2019-2024
Institute of High Energy Physics
2024
Government of Catalonia
2024
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
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...
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...
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...
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...
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.
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...
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.
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...
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...
The observation of Higgs boson production in association with a top quark pair ($t\bar{t}H$), based on the analysis proton-proton collision data at centre-of-mass energy 13 TeV recorded ATLAS detector Large Hadron Collider, is presented. Using corresponding to integrated luminosities up 79.8 fb$^{-1}$, and considering decays into $b\bar{b}$, $WW^*$, $\tau\tau$, $\gamma\gamma$, $ZZ^*$, observed significance 5.8 standard deviations, compared an expectation 4.9 deviations. Combined $t\bar{t}H$...
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...
Jet energy scale measurements and their systematic uncertainties are reported for jets measured with the ATLAS detector using proton-proton collision data a center-of-mass of s=13 TeV, corresponding to an integrated luminosity 3.2 fb−1 collected during 2015 at LHC. Jets reconstructed from deposits forming topological clusters calorimeter cells, anti-kt algorithm radius parameter R=0.4. calibrated series simulation-based corrections in situ techniques. In techniques exploit transverse...
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$$ GeV. Good agreement is observed number events Standard Model expectations....
Combined analyses of the Higgs boson production and decay rates as well its coupling strengths to vector bosons fermions are presented. The combinations include results $H\to\gamma\gamma,\, ZZ^*,\, WW^*,\, Z\gamma,\, b\bar{b},\, \tau\tau$ $\mu\mu$ modes, constraints on associated with a pair top quarks off-shell boson. based LHC proton-proton collision datasets, integrated luminosities up 4.7 $\mathrm{fb}^{-1}$ at $\sqrt{s}=7$ TeV 20.3 $\sqrt{s}=8$ TeV, recorded by ATLAS detector in 2011...
A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6 TeV is presented. The data were recorded by ATLAS experiment proton-proton collisions at a centre-of-mass energy $\sqrt{s}=$13 during Run 2 Large Hadron Collider correspond an integrated luminosity 139 fb$^{-1}$. functional form fitted dilepton invariant-mass distribution model contribution from background processes, generic signal shape used determine significance observed deviations this estimate. No...
The luminosity determination for the ATLAS detector at LHC during pp collisions $$\sqrt{s} =$$ 8 TeV in 2012 is presented. evaluation of scale performed using several luminometers, and comparisons between these detectors are made to assess accuracy, consistency long-term stability results. A uncertainty $$\delta \mathcal{L}/ \mathcal{L} = \pm 1.9\%$$ obtained $$22.7\,\mathrm {fb}^{-1}$$ collision data delivered 2012.
A search for squarks and gluinos in final states containing high-p T jets, missing transverse momentum no electrons or muons is presented. The data were recorded 2012 by the ATLAS experiment $$ \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...