A5016990122- 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
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Radiation Effects in Electronics
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Nuclear physics research studies
- Radiation Therapy and Dosimetry
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
- Structural Analysis of Composite Materials
University of Michigan–Ann Arbor
2016-2025
University of California, Santa Cruz
2017-2024
Rutherford Appleton Laboratory
2018-2024
Istanbul University
2024
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
2024
University of Geneva
2024
The University of Adelaide
2014-2023
Boğaziçi University
2022-2023
Ludwig-Maximilians-Universität München
2019-2023
We establish the existence of top quark using a 67 pb^-1 data sample Pbar-P collisions at Sqrt(s) = 1.8 TeV collected with Collider Detector Fermilab (CDF). Employing techniques similar to those we previously published, observe signal consistent t-tbar decay WW b-bbar, but inconsistent background prediction by 4.8 sigma. Additional evidence for is provided peak in reconstructed mass distribution. measure be 176 +/-8(stat) +/- 10(sys.) GeV/c^2, and production cross section 6.8 +3.6 -2.4 pb.
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...
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.
We present a new measurement of the inclusive and differential production cross sections $J/\ensuremath{\psi}$ mesons $b$ hadrons in proton-antiproton collisions at $\sqrt{s}=1960\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$. The data correspond to an integrated luminosity $39.7\text{ }{\mathrm{p}\mathrm{b}}^{\ensuremath{-}1}$ collected by CDF run II detector. find section for all transverse momenta from 0 $20\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ rapidity range $|y|<0.6$ be...
We report the observation of a narrow state decaying into $J/\psi\pi^+\pi^-$ and produced in $220 pb^{-1}$ $\bar{p} p $ collisions at $\sqrt{s}=1.96 TeV$ CDF II experiment. observe 730 \pm 90 decays. The mass is measured to be $3871.3 0.7 (stat) 0.4 (syst) MeV/c2$, with an observed width consistent detector resolution. This agreement recent by Belle Collaboration X(3872) meson.
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...
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...
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 mass of the W boson, a mediator weak force between elementary particles, is tightly constrained by symmetries standard model particle physics. Higgs boson was last missing component model. After observation measurement provides stringent test We measure mass, MW, using data corresponding to 8.8 inverse femtobarns integrated luminosity collected in proton-antiproton collisions at 1.96 tera-electron volt center-of-mass energy with CDF II detector Fermilab Tevatron collider. A sample...
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...
We present a new measurement of the inclusive forward-backward $t\overline{t}$ production asymmetry and its rapidity mass dependence. The measurements are performed with data corresponding to an integrated luminosity $5.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$, recorded CDF-II Detector Fermilab Tevatron. Significant asymmetries observed in both laboratory frame rest frame, cases found be consistent $CP$ conservation...
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$$ GeV. Good agreement is observed number events Standard Model expectations....
Combined analyses of the Higgs boson production and decay rates as well its coupling strengths to vector bosons fermions are presented. The combinations include results $H\to\gamma\gamma,\, ZZ^*,\, WW^*,\, Z\gamma,\, b\bar{b},\, \tau\tau$ $\mu\mu$ modes, constraints on associated with a pair top quarks off-shell boson. based LHC proton-proton collision datasets, integrated luminosities up 4.7 $\mathrm{fb}^{-1}$ at $\sqrt{s}=7$ TeV 20.3 $\sqrt{s}=8$ TeV, recorded by ATLAS detector in 2011...
The luminosity determination for the ATLAS detector at LHC during pp collisions $$\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 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...
We report the observation of ${B}_{s}^{0}\mathrm{\text{\ensuremath{-}}}{\overline{B}}_{s}^{0}$ oscillations from a time-dependent measurement oscillation frequency $\ensuremath{\Delta}{m}_{s}$. Using data sample $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ collected with CDF II detector Fermilab Tevatron, we find signals 5600 fully reconstructed hadronic ${B}_{s}$ decays, 3100 partially and 61 500 semileptonic decays....
We report the first observation of single top quark production using 3.2 fb^-1 pbar p collision data with sqrt{s}=1.96 TeV collected by Collider Detector at Fermilab. The significance observed is 5.0 standard deviations, and expected sensitivity for model decay in excess 5.9 deviations. Assuming m_t=175 GeV/c^2, we measure a cross section 2.3 +0.6 -0.5 (stat+syst) pb, extract CKM matrix element value |V_{tb}|=0.91 +-0.11 0.07(theory), set limit |V_{tb}|>0.71 95% C.L.
Evidence is reported for a narrow structure near the J/psivarphi threshold in exclusive B;{+} --> J/psivarphiK;{+} decays produced p[over]p collisions at sqrt[s] = 1.96 TeV. A signal of 14 +/- 5 events, with statistical significance excess 3.8 standard deviations, observed data sample corresponding to an integrated luminosity 2.7 fb;{-1}, collected by CDF II detector. The mass and natural width are measured be 4143.0 2.9(stat) 1.2(syst) MeV/c;{2} 11.7_{-5.0};{+8.3}(stat) 3.7(syst) MeV/c;{2}.
Abstract The algorithms used by the ATLAS Collaboration during Run 2 of Large Hadron Collider to identify jets containing b -hadrons are presented. performance is evaluated in simulation and efficiency with which these measured collision data. measurement uses a likelihood-based method sample highly enriched $$t{\bar{t}}$$ <mml:math...
An improved measurement of the mass Higgs boson is derived from a combined fit to reconstructed invariant spectra decay channels H→γγ and H→ZZ∗→4ℓ. The analysis uses pp collision data sample recorded by ATLAS experiment at CERN Large Hadron Collider center-of-mass energies 7 TeV 8 TeV, corresponding an integrated luminosity 25 fb−1. measured value mH=125.36±0.37(stat)±0.18(syst) GeV. This result based on energy-scale calibrations for photons, electrons, muons as well other improvements,...
ATLAS has measured two-particle correlations as a function of relative azimuthal-angle, $\Delta \phi$, and pseudorapidity, \eta$, in $\sqrt{s}$=13 2.76 TeV $pp$ collisions at the LHC using charged particles pseudorapidity interval $|\eta|$<2.5. The correlation functions evaluated different intervals charged-particle multiplicity show multiplicity-dependent enhancement \phi \sim 0$ that extends over wide range $\Delta\eta$, which been referred to "ridge". Per-trigger-particle yields,...
A measurement of the mass