A5105516147- 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
- High voltage insulation and dielectric phenomena
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Electrostatic Discharge in Electronics
- Medical Imaging Techniques and Applications
- Power Transformer Diagnostics and Insulation
- Radiation Detection and Scintillator Technologies
- Stochastic processes and financial applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Analytical Chemistry and Sensors
- Random Matrices and Applications
- Geophysical Methods and Applications
- Nuclear reactor physics and engineering
- Big Data Technologies and Applications
Carnegie Mellon University
2020-2025
Institute of High Energy Physics
2022-2024
University of Antwerp
2024
A. Alikhanyan National Laboratory
2022-2024
University of Colorado Boulder
2023
University of Chicago
2014-2023
Fermi National Accelerator Laboratory
2014-2023
Transylvania University of Brașov
2020
The University of Adelaide
2018-2019
Northern Illinois University
2016-2018
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...
A search for heavy neutral Higgs bosons and Z′ is performed using a data sample corresponding to an integrated luminosity of 36.1 fb−1 from proton-proton collisions at $$ \sqrt{s}=13 TeV recorded by the ATLAS detector LHC during 2015 2016. The resonance assumed decay τ +τ − with least one tau lepton decaying final states hadrons neutrino. in mass range 0.2-2.25 0.2-4.0 bosons. are good agreement background predicted Standard Model. results interpreted benchmark scenarios. In context hMSSM...
Algorithms used for the reconstruction and identification of electrons in central region ATLAS detector at Large Hadron Collider (LHC) are presented this paper; these algorithms physics analyses that involve final state which based on 2015 2016 proton–proton collision data produced by LHC $$\sqrt{s}$$ = 13 $$\text {TeV}$$ . The performance electron reconstruction, identification, isolation, charge is evaluated simulated samples using from $$Z \rightarrow ee$$ $$J/\psi decays. Typical...
Measurements of the space charge density across width a plane parallel sample degassed crosslinked polyethene (XLPE) have been made recently. Repeated at intervals throughout period applied high voltage, these measurements provide data on dynamics injection and development in under influence stepped DC voltage. In order to analyse data, simple model for bipolar injection, subsequent transport trapping has developed. This is reported this paper, numerical simulations generated, as function...
A search for electroweak production of supersymmetric particles in scenarios with compressed mass spectra final states two low-momentum leptons and missing transverse momentum is presented. This uses proton-proton collision data recorded by the ATLAS detector at Large Hadron Collider 2015--2016, corresponding to $36.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity $\sqrt{s}=13\text{ }\mathrm{TeV}$. Events same-flavor pairs electrons or muons opposite electric charge...
This letter describes the observation of light-by-light scattering process, $\gamma\gamma\rightarrow\gamma\gamma$, in Pb+Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity 1.73 nb$^{-1}$, collected November 2018 by ATLAS experiment LHC. Light-by-light candidates are selected events with two photons produced exclusively, each transverse energy $E_{\textrm{T}}^{\gamma} > 3$ GeV and pseudorapidity...
This paper describes a measurement of the inclusive top quark pair production cross-section (σtt¯) with data sample 3.2fb−1 proton–proton collisions at centre-of-mass energy s=13TeV, collected in 2015 by ATLAS detector LHC. uses events an opposite-charge electron–muon final state. Jets containing b-quarks are tagged using algorithm based on track impact parameters and reconstructed secondary vertices. The numbers exactly one two b-tagged jets counted used to determine simultaneously σtt¯...
The mass of the Higgs boson is measured in $H\rightarrow ZZ^* \rightarrow 4\ell$ and \gamma\gamma$ decay channels with 36.1 fb$^{-1}$ proton-proton collision data from Large Hadron Collider at a centre-of-mass energy 13 TeV recorded by ATLAS detector 2015 2016. value channel $m_{H}^{ZZ^{*}} = 124.79 \pm 0.37$ GeV, while $m_{H}^{\gamma \gamma} 124.93 0.40$ GeV. Combining these results measurement based on 7 8 yields $m_H=124.97 0.24$
A bstract search for charged Higgs bosons heavier than the top quark and decaying via H ± → tb is presented. The data analysed corresponds to 36.1 fb −1 of pp collisions at $$ \sqrt{s}=13 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:math> TeV was recorded with ATLAS detector LHC in 2015 2016. production a boson association bottom quark, tbH , explored mass range from m = 200 2000 GeV using...
A bstract search for new phenomena in events with two same-charge leptons or three and jets identified as originating from b -quarks a data sample of 36.1 fb −1 pp collisions at $$ \sqrt{s}=13 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:math> TeV recorded by the ATLAS detector Large Hadron Collider is reported. No significant excess found limits are set on vector-like quark, four-top-quark,...
Abstract The results of a search for electroweakino pair production $$pp \rightarrow \tilde{\chi }^\pm _1 }^0_2$$ <mml:math...
This Letter presents the observation and measurement of electroweak production a same-sign W boson pair in association with two jets using 36.1 fb^{-1} proton-proton collision data recorded at center-of-mass energy sqrt[s]=13 TeV by ATLAS detector Large Hadron Collider. The analysis is performed fiducial phase-space region, defined presence leptons, electron or muon, least large invariant mass rapidity difference. A total 122 candidate events are observed for background expectation 69±7...
This paper presents a search for massive charged long-lived particles produced in pp collisions at s=13 TeV the LHC using ATLAS experiment. The data set used corresponds to an integrated luminosity of 3.2 fb−1. Many extensions Standard Model predict existence particles, such as R-hadrons. These are expected be with velocity significantly below speed light, and therefore have specific ionization higher than any particle unit charge high momenta. Pixel subsystem detector is measure energy loss...
A search is conducted for a new beyond-the-Standard-Model boson using events where Higgs with mass 125 GeV decays to four leptons ($\ell =$ $e$ or $\mu$). This decay presumed occur via an intermediate state which contains one two on-shell, promptly decaying bosons: $H\rightarrow ZX/XX \rightarrow 4\ell$, $X$ vector $Z_d$ pseudoscalar $a$ between 1 and 60 GeV. The uses $pp$ collision data collected the ATLAS detector at LHC integrated luminosity of 36.1 fb$^{-1}$ centre-of-mass energy...
A search is presented for pair production of a new heavy quark (Q) that decays into W boson and light (q) in the final state where one leptonically (to an electron or muon plus neutrino) other hadronically. The analysis performed using integrated luminosity 20.3 fb−1 pp collisions at s=8 TeV collected by ATLAS detector LHC. No evidence QQ¯ observed. New chiral quarks with masses below 690 GeV are excluded 95% confidence level, assuming BR(Q→Wq)=1. Results also interpreted context vectorlike...
A measurement of observables sensitive to spin correlations in $t\bar{t}$ production is presented, using 36.1 fb$^{-1}$ $pp$ collision data at $\sqrt{s} = 13$ TeV recorded with the ATLAS detector Large Hadron Collider. Differential cross-sections are measured events exactly one electron and muon opposite-sign electric charge as a function azimuthal opening angle absolute difference pseudorapidity between candidates laboratory frame. The also invariant mass system. differential compared...
Abstract A measurement of the $$ B_{s}^{0} \rightarrow J/\psi \phi <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mi>ϕ</mml:mi> </mml:math> decay parameters using 80.5\, \mathrm {fb^{-1}} <mml:mn>80.5</mml:mn> <mml:mspace/> <mml:msup> <mml:mi>fb</mml:mi> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn>...
A pulsed electro-acoustic system is described which enables electric fields up to be generated in thin (100-) insulating plaque samples with measurement of the dynamic net space charge density, as a function temperature and distance through thickness sample, external circuit charging current. From these measurements, field, potential conduction current density distributions within low-density polyethene have been obtained are reported.
The production of a top quark in association with $Z$ boson is investigated. proton--proton collision data collected by the ATLAS experiment at LHC 2015 and 2016 centre-of-mass energy $\sqrt{s} = 13 \mathrm{TeV}$ are used, corresponding to an integrated luminosity $36.1 \mathrm{fb}^{-1}$. Events containing three identified leptons (electrons and/or muons) two jets, one which as $b$-quark jet selected. major backgrounds diboson, $t\bar{t}$ $Z\mathrm{+jets}$ production. A neural network used...
Results from a search for supersymmetry in events with four or more charged leptons (electrons, muons and taus) are presented. The analysis uses data sample corresponding to 36.1 fb−1 of proton–proton collisions delivered by the Large Hadron Collider at √s=13 TeV recorded ATLAS detector. Four-lepton signal regions up two hadronically decaying taus designed target range supersymmetric scenarios that can be either enriched depleted involving production decay Z boson. Data yields consistent...
A measurement of the top-antitop $$ \left(t\overline{t}\right) charge asymmetry is presented using data corresponding to an integrated luminosity 4.6 fb−1 LHC pp collisions at a centreof-mass energy 7 TeV collected by ATLAS detector. Events with two charged leptons, least jets and large missing transverse momentum are selected. Two observables studied: C based on identified {A}_{\mathrm{C}}^{t\overline{t}} , reconstructed tt final state. The asymmetries measured be {A}_{\mathrm{C}}^{\ell...
A measurement of jet substructure variables is presented using data collected in 2016 by the ATLAS experiment at LHC with proton-proton collisions $\sqrt{s}=13$ TeV. Large-radius jets groomed trimming and soft-drop algorithms are studied. Dedicated event selections used to study produced light quarks or gluons, hadronically decaying top $W$ bosons. The measured sensitive pronged substructure, therefore typically for tagging from boosted massive particles. These include energy correlation...
We describe the construction of end-to-end jet image classifiers based on simulated low-level detector data to discriminate quark- vs. gluon-initiated jets with high-fidelity CMS Open Data. highlight importance precise spatial information and demonstrate competitive performance existing state-of-the-art classifiers. further generalize approach event-level classification quark gluon di-jet QCD events. compare fully using hand-engineered features that algorithm is robust against effects...
This letter reports the results of a search for top and bottom squarks from gluino pair production in 4.7 fb^-1 pp collisions at sqrt(s) = 7 TeV using ATLAS detector LHC. The is performed events with large missing transverse momentum least three jets identified as originating b-quark. Exclusion limits are presented variety gluino-mediated models masses up to 1 excluded.