V. E. Barnes
A5081588490- 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
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Botany, Ecology, and Taxonomy Studies
- Archaeology and Natural History
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Geological and Geochemical Analysis
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Geology and Paleoclimatology Research
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- Mineralogy and Gemology Studies
- Geochemistry and Geologic Mapping
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Water Quality and Resources Studies
- Atomic and Subatomic Physics Research
Purdue University West Lafayette
2016-2025
European Organization for Nuclear Research
2012-2024
A. Alikhanyan National Laboratory
2022-2024
Institute of High Energy Physics
2022-2024
Purdue University System
2024
University of Antwerp
2023-2024
Vrije Universiteit Brussel
2023-2024
Purdue University Northwest
2023
University of Wisconsin–Madison
1976-2021
University of Glasgow
2012-2019
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...
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...
We combine searches by the CDF and D0 Collaborations for associated production of a Higgs boson with $W$ or $Z$ subsequent decay to bottom-antibottom quark pair. The data, originating from Fermilab Tevatron $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, correspond integrated luminosities up $9.7\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. are conducted mass in range $100--150\text{ }\mathrm{GeV}/{c}^{2}$. observe an excess events data compared background predictions,...
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...
Inclusive J/\ensuremath{\psi} and \ensuremath{\psi}(2S) production has been studied in p\ifmmode\bar\else\textasciimacron\fi{}p collisions at \ensuremath{\surd}s =1.8 TeV using 2.6\ifmmode\pm\else\textpm\fi{}0.2 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ of data taken with the Collider Detector Fermilab. The products cross section times branching fraction were measured as functions ${\mathit{P}}_{\mathit{T}}$ for...
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 present measurements of the pseudorapidity (η) distribution charged particles (dNchdη) produced within |η|≤3.5 in proton-antiproton collisions at √s 630 and 1800 GeV. measure dNchdη η=0 to be 3.18±0.06(stat)±0.10(syst) GeV, 3.95±0.03 (stat)±0.13(syst) Many systematic errors ratio two energies cancel, we 1.26±0.01±0.04 for GeV that |η|≤3. Comparing lower-energy data, observe an increase faster than ln(s) η=0.Received 2 October 1989DOI:https://doi.org/10.1103/PhysRevD.41.2330©1990 American...
The inclusive jet differential cross section has been measured for transverse energies, ET, from 15 to 440 GeV, in the pseudorapidity region 0.1≤|η|≤0.7. results are based on 19.5pb−1 of data collected by CDF Collaboration at Fermilab Tevatron collider. compared with QCD predictions various sets parton distribution functions. jets ET>200GeV is significantly higher than current O(αs3) perturbative calculations. Various possible explanations high- ET excess discussed.Received 25 January...
We present new measurements of the inclusive forward-backward ttbar production asymmetry, AFB, and its dependence on several properties system. The are performed with full Tevatron data set recorded CDF II detector during ppbar collisions at sqrt(s) = 1.96 TeV, corresponding to an integrated luminosity 9.4 fb^(-1). measure asymmetry using rapidity difference Delta-y=y_(t)-y_(tbar). Parton-level results derived, yielding 0.164+/-0.047 (stat + syst). observe a linear AFB top-quark pair mass...
Measurements of inclusive transverse-momentum spectra for charged particles produced in proton-antiproton collisions at √2 630 and 1800 GeV are presented compared with data taken lower energies.Received 8 June 1988DOI:https://doi.org/10.1103/PhysRevLett.61.1819©1988 American Physical Society
Kinematic properties of four-jet events produced in $p\overline{p}$ collisions at $\sqrt{s}=1.8$ TeV have been studied using data with an integrated luminosity 325 ${\mathrm{nb}}^{\ensuremath{-}1}$ collected the Collider Detector Fermilab during 1988-1989 run. The individual jet ${p}_{T}$ spectra and angles between each pair are compared to predictions leading-order quantum chromodynamics for double gluon bremsstrahlung process good agreement is observed. In addition, a search parton...
This paper gives the results of a study inelastic charged-current interactions muon-type neutrinos with hydrogen and deuterium targets using Argonne 12-foot bubble chamber. We discuss in detail separation events from background. For single-pion production reactions $\ensuremath{\nu}p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}p{\ensuremath{\pi}}^{+}$, $\ensuremath{\nu}n\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}n{\ensuremath{\pi}}^{+}$,...
This paper gives the results of a study single-pion production by weak charged current utilizing wide-band muon-type-neutrino beam at Argonne Zero Gradient Synchrotron. The data were obtained from hydrogen and deuterium fillings 12-ft bubble chamber. methods event selection separation background are given as details corrections systematic effects in sample. energy-dependent cross sections differential distributions presented for three reactions...
This paper gives a detailed description of an experiment which studies the interactions muon-type neutrinos in hydrogen and deuterium. The was performed at Zero Gradient Synchrotron using wide-band neutrino beam incident on Argonne 12-foot bubble chamber filled with energy spectrum peaks 0.5 GeV has tail extending to 6 GeV. shape intensity flux is determined measurements pion yields from beryllium. produced pions are focused by one or (for latter part experiment) two magnetic horns. A total...
We have measured the $W$-boson mass ${M}_{W}$ using data corresponding to $2.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ with CDF II detector Fermilab Tevatron collider. Samples consisting 470 126 $W\ensuremath{\rightarrow}e\ensuremath{\nu}$ candidates and 624 708 $W\ensuremath{\rightarrow}\ensuremath{\mu}\ensuremath{\nu}$ yield measurement ${M}_{W}=80\text{...
We combine six measurements of the inclusive top-quark pair (ttbar) production cross section (sigma_ttbar) from data collected with CDF and D0 detectors at Fermilab Tevatron proton anti-proton collisions sqrt{s} = 1.96 TeV. The correspond to integrated luminosities up 8.8 fb^{-1}. obtain a value sigma_ttbar 7.60 \pm 0.41 pb for mass m_t=172.5 GeV. contributions uncertainty are 0.20 statistical sources, 0.29 systematic 0.21 on luminosity. result is in good agreement standard model expectation...
Proton-proton scattering has been studied at 970 MeV using the Birmingham University 1-BeV synchrotron and a 9-in.-diam liquid-hydrogen bubble chamber; 3945 events have analyzed cross sections determined for various reactions. The elastic section of 24.8\ifmmode\pm\else\textpm\fi{}0.9 mb is significantly higher than result Dowell et al. counters. two experiments agree on shape angular distribution, but not its normalization; possible reasons this are discussed. distribution peaked strongly...
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 report on measurements of the inclusive jet production cross section as a function transverse momentum in pp¯ collisions at s=1.96 TeV, using kT algorithm and data sample corresponding to 1.0 fb−1 collected with Collider Detector Fermilab run II. The are carried out five different rapidity regions |yjet|<2.1 range 54<pTjet<700 GeV/c. Next-to-leading order perturbative QCD predictions good agreement measured sections.4 MoreReceived 29 January 2007Publisher error corrected 25 May...