A5016059680- 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
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Distributed and Parallel Computing Systems
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
- Stellar, planetary, and galactic studies
- Scientific Research and Discoveries
- International Science and Diplomacy
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
University of Rochester
2016-2025
Institute of High Energy Physics
2015-2024
University of Antwerp
2024
A. Alikhanyan National Laboratory
2022-2024
Rutgers, The State University of New Jersey
2010-2023
RWTH Aachen University
2017
Centre National de la Recherche Scientifique
2001-2016
Universidade Federal do ABC
2010-2016
Institut National de Physique Nucléaire et de Physique des Particules
2001-2016
University of Science and Technology of China
2011-2016
We present a measurement of forward-backward asymmetry in top quark-antiquark production proton-antiproton collisions the final state containing lepton and at least four jets. Using dataset corresponding to an integrated luminosity $5.4\,\mathrm {fb}^{-1}$, collected by \DZ\ experiment Fermilab Tevatron Collider, we measure \ttbar\ be $(9.2 \pm 3.7)$% reconstruction level. When corrected for detector acceptance resolution, is found $(19.6 6.5)$%. also based on from quark decay, $(15.2...
The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg$^2$ over five years constrain the cosmic expansion history through precise measurements of Baryon Acoustic Oscillations (BAO). scientific program for DESI evaluated during month Survey Validation (SV) campaign before beginning full operations. This produced deep spectra tens thousands objects from each stellar (MWS), bright galaxy (BGS), luminous red (LRG), emission line (ELG), and quasar...
Abstract The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from constitute the first major data sample DESI survey. This paper describes public release those spectra, catalogs derived properties, intermediate products. In total, includes good-quality spectral information 466,447 objects targeted as part Milky Way Survey, 428,758 Bright Galaxy 227,318 Luminous Red sample, 437,664 Emission Line...
The Dark Energy Spectroscopic Instrument (DESI) completed its five-month Survey Validation in May 2021. Spectra of stellar and extragalactic targets from constitute the first major data sample DESI survey. This paper describes public release those spectra, catalogs derived properties, intermediate products. In total, includes good-quality spectral information 466,447 objects targeted as part Milky Way Survey, 428,758 Bright Galaxy 227,318 Luminous Red sample, 437,664 Emission Line 76,079...
We have observed bottom-charm mesons B_c via the decay mode Bc -> J/psi lepton neutrino in 1.8 TeV p-bar p collisions using CDF detector at Fermilab Tevatron. A fit of background and signal contributions to + mass distribution yielded 20.4 +6.2 -5.5 events from mesons. same with alone was rejected level 4.8 standard deviations. measured be 6.40 +- 0.39 0.13 GeVc^2 lifetime tau(B_c) = 0.46 +0.18 -0.16 0.03 ps. production cross section times branching ratio for relative that B+ K 0.132 +0.041...
We present a study of $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$ production in $p\overline{p}$ collisions, at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ with the CDF detector Fermilab. The mesons are reconstructed using their ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decay modes. have measured inclusive cross section for both as function transverse momentum central region, $|\ensuremath{\eta}|<0.6$. also measure fraction these events...
A strong signal for double parton (DP) scattering is observed in a $16{\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ sample of $\overline{p}p\ensuremath{\rightarrow}\ensuremath{\gamma}/{\ensuremath{\pi}}^{0}+3\mathrm{jets}+X$ data from the CDF experiment at Fermilab Tevatron. In DP events, two separate hard scatterings take place single $\overline{p}p$ collision. We isolate large $(\ensuremath{\sim}14000\mathrm{events})$ which 53% are found to be DP. The process-independent parameter scattering,...
We have measured the fraction of $J/\ensuremath{\psi}$ mesons originating from ${\ensuremath{\chi}}_{c}$ meson decays in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$. The fraction, for ${P}_{T}^{J/\ensuremath{\psi}}>4.0\mathrm{GeV}/c$ and $|{\ensuremath{\eta}}^{J/\ensuremath{\psi}}|<0.6$, not including contributions $b$ flavored hadrons, is...
We report the observation of bottom-charmed mesons ${B}_{c}$ in 1.8 TeV $p\overline{p}$ collisions using CDF detector at Fermilab Tevatron. The were found through their semileptonic decays, ${B}_{c}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{l}^{\ifmmode\pm\else\textpm\fi{}}X.$ A fit to $J/\ensuremath{\psi}l$ mass distribution yielded ${20.4}_{\ensuremath{-}5.5}^{+6.2}$ events from mesons. test null hypothesis, i.e., an attempt data with background alone, was...
We have measured the polarization of J/psi and psi(2S) mesons produced in pp collisions at sqrt[s] = 1.8 TeV, using data collected Collider Detector Fermilab during 1992-1995. The promptly [psi(2S)] is isolated from those B-hadron decay, over kinematic range 4 [5.5]<P(T)<20 GeV/c |y|<0.6. For P(T) greater than or approximately equal 12 we do not observe significant prompt component.
We report evidence of a narrow structure, $X(5568)$, in the decay sequence $X(5568) \rightarrow B_s^0 π^{\pm}$, $B_s^0 J/ψϕ$, $J/ψ\rightarrow μ^+ μ^-$, $ϕ\rightarrow K^+K^-$. This is for first instance hadronic state with valence quarks four different flavors. The mass and natural width this are measured to be $m = 5567.8 \pm 2.9 {\rm \thinspace (stat)} ^{+0.9}_{-1.9} (syst)}$ MeV/$c^2$ $Γ= 21.9 6.4 ^{+5.0}_{-2.5} (syst)} $ MeV/$c^2$. If B_s^* π^{\pm} γπ^{\pm}$ an unseen $γ$, $m(X(5568))$...
We present an updated measurement of the anomalous like-sign dimuon charge asymmetry Aslb for semi-leptonic $b$-hadron decays in 9.0 fb^-1 p pbar collisions recorded with D0 detector at a center-of-mass energy sqrt{s} = 1.96 TeV Fermilab Tevatron collider. obtain (-0.787 +- 0.172(stat) 0.093 (syst))%. This result differs by 3.9 standard deviations from prediction model and provides evidence anomalously large CP violation neutral B decay. The dependence on muon impact parameter is consistent...
We present a measurement of the W boson mass using data corresponding to 4.3fb^-1 integrated luminosity collected with D0 detector during Run II at Fermilab Tevatron p\bar{p} collider. With sample 1,677,394 -> e\nu candidate events, we measure M_W = 80.367 +/- 0.026 GeV. This result is combined an earlier determined independent sample, 1fb^-1 luminosity, yield 80.375 0.023
We report an updated measurement of the $CP$-violating phase, ${\ensuremath{\phi}}_{s}^{J/\ensuremath{\psi}\ensuremath{\phi}}$, and decay-width difference for two mass eigenstates, $\ensuremath{\Delta}{\ensuremath{\Gamma}}_{s}$, from flavor-tagged decay ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$. The data sample corresponds to integrated luminosity $8.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ accumulated with D0 detector using $p\overline{p}$ collisions...
We investigate the decay ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}{K}^{+}$ in a search for $X(4140)$ state, narrow threshold resonance $J/\ensuremath{\psi}\ensuremath{\phi}$ system. The data sample corresponds to an integrated luminosity of $10.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ collected by D0 experiment Fermilab Tevatron collider. observe mass peak with statistical significance 3.1...
We present a measurement of the forward–backward asymmetry in top quark–antiquark production using full Tevatron Run II data set collected by D0 experiment at Fermilab. The is performed lepton+jets final states new kinematic fitting algorithm for events with four or more jets and partial reconstruction only three jets. Corrected detector acceptance resolution effects, evaluated to be AFB=(10.6±3.0)%. Results are consistent standard model predictions which range from 5.0% 8.8%. also...
We present the observation of doubly-produced $J/\psi$ mesons with D0 detector at Fermilab in $p\bar{p}$ collisions $\sqrt{s}=1.96$ TeV. The production cross section for both singly and is measured using a sample an integrated luminosity 8.1fb$^{-1}$. For first time, double separated into contributions due to single parton scatterings. Using these measurements, we determine effective $\sigma_{eff}$, parameter characterizing spatial area parton-parton interactions related density inside nucleon.
The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg$^2$ over five years constrain the cosmic expansion history through precise measurements of Baryon Acoustic Oscillations (BAO). scientific program for DESI evaluated during month Survey Validation (SV) campaign before beginning full operations. This produced deep spectra tens thousands objects from each stellar (MWS), bright galaxy (BGS), luminous red (LRG), emission line (ELG), and quasar...
We have searched for heavy neutral gauge bosons (Z′) in dielectron and dimuon decay modes using 110pb−1 of ¯pp collisions at √s=1.8TeV collected with the Collider Detector Fermilab. present a limit on production cross section times branching ratio Z′ boson decaying into dileptons as function mass. For mass MZ′>600GeV/c2, upper is 40 fb 95% confidence level. set lower limits 690, 590, 620, 595, 565, 630, 600GeV/c2 Z′SM, Zψ, Zη, Zχ, ZI, ZLR, ZALRM, respectively.Received 6 May...
We present a search for events consistent with the production and decay of squarks gluinos minimal supersymmetric standard model (MSSM) in D0 detector at Fermilab Tevatron $p\overline{p}$ collider. examined data containing large missing transverse energy three or more jets. observed no excess above expected yield from processes. For choice MSSM parameter values, we set lower limit 95% confidence level on mass gluino 144 GeV ${/c}^{2}$ all squark masses 212 equal masses.
We present an improved determination of the total width top quark, ${\ensuremath{\Gamma}}_{t}$, using $5.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity collected by D0 Collaboration at Tevatron $p\overline{p}$ Collider. The ${\ensuremath{\Gamma}}_{t}$ is extracted from partial decay $\ensuremath{\Gamma}(t\ensuremath{\rightarrow}Wb)$ and branching fraction $\mathcal{B}(t\ensuremath{\rightarrow}Wb)$. obtained $t$-channel single top-quark production cross section...