A5041704525- 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
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Computing and Data Management
- Radiomics and Machine Learning in Medical Imaging
- International Science and Diplomacy
- Astro and Planetary Science
- Scientific Research and Discoveries
- Radioactivity and Radon Measurements
- CCD and CMOS Imaging Sensors
University of Maryland, College Park
2015-2025
European Organization for Nuclear Research
2012-2013
Harvard University Press
1985-1995
Stanford University
1983-1993
University of California, Berkeley
1983-1993
Stanford Synchrotron Radiation Lightsource
1983-1993
SLAC National Accelerator Laboratory
1983-1993
Lawrence Berkeley National Laboratory
1982-1993
Harvard University
1986-1993
Johns Hopkins University
1989-1992
The D0 Collaboration reports on a search for the standard model top quark in pp¯ collisions at s=1.8TeV Fermilab Tevatron with an integrated luminosity of approximately 50pb−1. We have searched tt¯ production dilepton and single-lepton decay channels without tagging b-quark jets. observed 17 events expected background 3.8±0.6 events. probability upward fluctuation to produce signal is 2×10−6 (equivalent 4.6 deviations). kinematic properties excess are consistent decay. conclude that we...
The production and event topology of three-jet events produced in p¯p collisions at √s=1.8 TeV have been studied with the Collider Detector Fermilab Tevatron Collider. distributions angular variables (ψ∗ cosθ∗) describing energy sharing between jets (x3 x4) are found to agree well tree-level QCD calculations. These predicted different shapes for initial-state subprocesses (quark-antiquark, quark-gluon, gluon-gluon). data consistent small expected contribution from quark-antiquark initial...
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...
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...
The average lifetime of bottom hadrons was measured with the Mark II vertex detector at storage ring PEP. determined by measuring impact parameters leptons produced in decays. ${\ensuremath{\tau}}_{b}=({12.0}_{\ensuremath{-}3.6}^{+4.5}\ifmmode\pm\else\textpm\fi{}3.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$ sec found.
We present a new high-statistics measurement of the cross section for process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ at center-of-mass energy 29 GeV invariant pion-pair masses $M({\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})$ between 350 MeV/${\mathit{c}}^{2}$ and 1.6 GeV/${\mathit{c}}^{2}$. observe ${f}_{2}(1270)$ measure its radiative width to be...
We have analyzed events with jets and large missing transverse energy produced in p¯p colisions at √s =1.8 TeV. The observed event rate is consistent standard model predictions. In a version of the supersymmetry (SUSY) light photino (mγ̃<15 GeV/c2) no cascade decays, we exclude 90% confidence level existence squarks gluinos masses less than 126 141 GeV/c2, respectively. mass limits are lower other choices SUSY parameters. An example presented.Received 17 August...
We present results from searches for the top quark pp\ifmmode\bar\else\textasciimacron\fi{} collisions at Fermilab Tevatron Collider. The data sample was collected during 1988--89 with Collider Detector and has an integrated luminosity of 4.1 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$. Our previous search e\ensuremath{\mu} final states tt\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}e\ensuremath{\nu}b \ensuremath{\mu}\ensuremath{\nu}b\ifmmode\bar\else\textasciimacron\fi{}...
We have determined mW=79.91±0.39 GeV/c2 from an analysis of W→eν and W→μν data the Collider Detector at Fermilab in p¯p collisions a c.m. energy √s =1.8 TeV. This result, together with world-average Z mass, determines weak mixing angle to be sin2θW=0.232±0.008. Bounds on top-quark mass are discussed.Received 13 August 1990DOI:https://doi.org/10.1103/PhysRevLett.65.2243©1990 American Physical Society
An analysis of ${Z}^{0}$\ensuremath{\rightarrow}${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ and ${Z}^{0}$\ensuremath{\rightarrow}${\ensuremath{\mu}}^{+}$${\ensuremath{\mu}}^{\mathrm{\ensuremath{-}}}$ data from the Collider Detector at Fermilab in p\ifmmode\bar\else\textasciimacron\fi{}p collisions \ensuremath{\surd}s =1.8 TeV yields a mass ${Z}^{0}$ boson ${M}_{Z}$=90.9\ifmmode\pm\else\textpm\fi{}0.3 (stat+syst)\ifmmode\pm\else\textpm\fi{}0.2 (scale) GeV/${c}^{2}$ width...
An analysis of high-transverse-momentum electrons using data from the Collider Detector at Fermilab (CDF) ¯pp collisions √s=1800 GeV yields values production cross section times branching ratio for W and Z0 bosons σ(¯pp→WX→eνX)=2.19±0.04(stat)±0.21(syst) nb σ(¯pp→Z0X→e+e−X)=0.209±0.013(stat)±0.017(syst) nb. Detailed descriptions CDF electron identification, background, efficiency, acceptance are included. Theoretical predictions sections that include a mass top quark larger than mass,...
The branching ratios for ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ and ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}(n{\ensuremath{\pi}}^{0}){\ensuremath{\nu}}_{\ensuremath{\tau}}$, $n>~1$, have been measured to be 0.078...
The differential cross sections for lepton pair production in e+e− annihilation at 29 GeV have been measured and found to be good agreement with the standard model of electroweak interaction. With assumption e−μ−τ universality, weak neutral-current couplings are determined ga2=0.23±0.05 gv2=0.03±0.04.Received August 1983DOI:https://doi.org/10.1103/PhysRevLett.51.1941©1983 American Physical Society
We report a new measurement of the cross section for production isolated photons with transverse energies ( ${E}_{T}^{\ensuremath{\gamma}}$) above 10 GeV and pseudorapidities $|\ensuremath{\eta}|<2.5$ in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$. The results are based on data sample $107.6{\mathrm{pb}}^{\ensuremath{-}1}$ recorded during 1992--1995 D0 detector Fermilab Tevatron collider. background, predominantly from jets which...
In $p\overline{p}$ collisions at $\sqrt{s}=1.8$ TeV we find jet events with a rapidity gap topology. The number of hadrons in the interval $\ensuremath{\Delta}{\ensuremath{\eta}}_{D}$ between leading-jet cones was sampled by charged tracks ${P}_{T}>400$ MeV/c. We excess trackless beyond that expected smooth multiplicity distribution. control region outside see no excess. For $\ensuremath{\Delta}{\ensuremath{\eta}}_{D}>0.8$, fraction events, consistent estimates based on exchange...
The first prompt photon measurement from the CDF experiment at Fermilab $p\overline{p}$ Collider is presented. Two independent methods are used to measure cross section: one for high transverse momentum (${P}_{T}$) and lower ${P}_{T}$. Comparisons various theoretical calculations shown. section agrees qualitatively with QCD but has a steeper slope low
We present a measurement of the b-quark cross section in 1.8 TeV p-p\ifmmode\bar\else\textasciimacron\fi{} collisions recorded with Collider Detector at Fermilab using muonic decays. In central rapidity region (\ensuremath{\Vert}${\mathit{y}}^{\mathit{b}}$\ensuremath{\Vert}1.0), is 295\ifmmode\pm\else\textpm\fi{}21\ifmmode\pm\else\textpm\fi{}75 nb (59\ifmmode\pm\else\textpm\fi{}14\ifmmode\pm\else\textpm\fi{}15 nb) for ${\mathit{p}}_{\mathit{T}}^{\mathit{b}}$>21 GeV/c (29 GeV/c)....
Abstract The upgrade of the CMS experiment for high luminosity operation LHC comprises replacement current endcap calorimeter by a granularity sampling (HGCAL). electromagnetic section HGCAL is based on silicon sensors interspersed between lead and copper (or tungsten) absorbers. hadronic uses layers stainless steel as an absorbing medium active in regions radiation exposure, scintillator tiles directly read out photomultipliers remaining regions. As part development detector its readout...
We observe both the JPC=1++ f1(1285) and JPC=0−+ η’(958) in tagged two-photon interactions untagged interactions. The measured Q2 dependence decay distribution support spin parity assignment. radiative width of is as (M2/Q2)Γγγ*=9.4±2.5±1.7 keV, on assumption a ρ-pole form factor.Received 18 September 1987DOI:https://doi.org/10.1103/PhysRevLett.59.2012©1987 American Physical Society
We confirm the observation of a spin-1 resonance at 1423 MeV in K0SK±π∓ system produced single-tagged two-photon interactions. The Dalitz plot indicates that this decays primarily via K*K intermediate state. measure radiative width times branching ratio BKK¯π(M2/Q2)Γγγ*=3.2±1.4±0.6 keV on assumption ρ-pole form factor.Received 18 September 1987DOI:https://doi.org/10.1103/PhysRevLett.59.2016©1987 American Physical Society
We have searched for the production of a neutral gauge boson (Z\ensuremath{'}) with mass above 100 Gev/${\mathrm{c}}^{2}$ in p\ifmmode\bar\else\textasciimacron\fi{}p collisions Collider Detector at Fermilab. present 95% confidence level (C.L.) limit on Z\ensuremath{'}\ensuremath{\rightarrow}${\mathrm{\ensuremath{\mu}}}^{+}$${\mathrm{\ensuremath{\mu}}}^{\mathrm{\ensuremath{-}}}$ cross section. combine Z\ensuremath{'} that from our previous dielectron search; combined result sets...
The charged-particle multiplicities of hadronic events deriving from produced bottom or charm quarks have been measured in the Mark II detector at PEP ${e}^{+}{e}^{\ensuremath{-}}$ annihilation 29 GeV. For containing one semileptonic and weak decay, we find 15.2\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.7 for 13.0\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.8 charm. corresponding charged particles accompanying pair heavy hadrons are...