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Open Access Publications from the University of California

Scholarly Works (19 results)

  • Article
LBL Publications (2001)
    Cover page: Initial Test Results of an Ionization Chamber Shower Detector for a LHC Luminosity Monitor
    • Article
    LBL Publications (2001)
      Cover page: Initial Test Results of an Ionization Chamber Shower Detector for a LHC Luminosity MonitorCreative Commons 'BY' version 4.0 license
      • Article
      LBL Publications (2000)
        Cover page: An Ionization Chamber Shower Detector for the LHC Luminosity MonitorCreative Commons 'BY' version 4.0 license
        • Article
        • Peer Reviewed
        LBL Publications (2007)
          • Article
          • Peer Reviewed
          UC San Diego Previously Published Works (2013)
          A search for physics beyond the standard model is performed with events having one or more hadronically decaying τ leptons, highly energetic jets, and large transverse momentum imbalance. The data sample corresponds to an integrated luminosity of 4.98 fb-1 of proton-proton collisions at [Formula: see text] collected with the CMS detector at the LHC in 2011. The number of observed events is consistent with predictions for standard model processes. Lower limits on the mass of the gluino in supersymmetric models are determined.
            Cover page: Search for physics beyond the standard model in events with τ leptons, jets, and large transverse momentum imbalance in pp collisions at
            • Article
            • Peer Reviewed
            UC Riverside Previously Published Works (2012)
            A measurement is presented of the relative prompt production rate of χc2 and χc1 with 4.6 fb-1 of data collected by the CMS experiment at the LHC in pp collisions at [Formula: see text]. The two states are measured via their radiative decays χc→J/ψ+γ, with the photon converting into an e+e- pair for J/ψ rapidity |y(J/ψ)|<1.0 and photon transverse momentum pT(γ)>0.5 GeV/c. The measurement is given for six intervals of pT(J/ψ) between 7 and 25 GeV/c. The results are compared to theoretical predictions.
              Cover page: Measurement of the relative prompt production rate of <i>χ</i><sub>c2</sub> and <i>χ</i><sub>c1</sub> in pp collisions at [Formula: see text].
              • Article
              • Peer Reviewed
              UCLA Previously Published Works (2014)
              The mass of the top quark is measured using a sample of [Formula: see text] candidate events with at least six jets in the final state. The sample is selected from data collected with the CMS detector in pp collisions at [Formula: see text] TeV in 2011 and corresponds to an integrated luminosity of 3.54 [Formula: see text]. The mass is reconstructed for each event employing a kinematic fit of the jets to a [Formula: see text] hypothesis. The top-quark mass is measured to be [Formula: see text] GeV. A combination with previously published measurements in other decay modes by CMS yields a mass of [Formula: see text] GeV.
                Cover page: Measurement of the top-quark mass in all-jets tt¯ events in pp collisions at s=7 TeV
                • Article
                • Peer Reviewed
                UCLA Previously Published Works (2011)
                Measurements are presented of the differential cross sections for Z bosons produced in proton-proton collisions at s = 13 TeV and decaying to muons and electrons. The data analyzed were collected in 2016 with the CMS detector at the LHC and correspond to an integrated luminosity of 35.9 fb−1. The measured fiducial inclusive product of cross section and branching fraction agrees with next-to-next-to-leading order quantum chromodynamics calculations. Differential cross sections of the transverse momentum pT, the optimized angular variable ϕη∗, and the rapidity of lepton pairs are measured. The data are corrected for detector effects and compared to theoretical predictions using fixed order, resummed, and parton shower calculations. The uncertainties of the measured normalized cross sections are smaller than 0.5% for ϕη∗< 0.5 and for pTZ< 50 GeV. [Figure not available: see fulltext.]
                  Cover page: Measurement of the differential dijet production cross section in proton–proton collisions at s=7 TeV
                  • Article
                  • Peer Reviewed
                  UCLA Previously Published Works (2012)
                  Measurements from the CMS experiment at the LHC of dihadron correlations for charged particles produced in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2. 76 TeV are presented. The results are reported as a function of the particle transverse momenta (pT) and collision centrality over a broad range in relative pseudorapidity (Δη) and the full range of relative azimuthal angle (Δφ). The observed two-dimensional correlation structure in Δη and Δφ is characterised by a narrow peak at (Δη,Δφ)≈(0,0) from jet-like correlations and a long-range structure that persists up to at least {pipe}Δη{pipe}=4. An enhancement of the magnitude of the short-range jet peak is observed with increasing centrality, especially for particles of pT around 1-2 GeV/c. The long-range azimuthal dihadron correlations are extensively studied using a Fourier decomposition analysis. The extracted Fourier coefficients are found to factorise into a product of single-particle azimuthal anisotropies up to pT≈3-3. 5 GeV/c for at least one particle from each pair, except for the second-order harmonics in the most central PbPb events. Various orders of the single-particle azimuthal anisotropy harmonics are extracted for associated particle pT of 1-3 GeV/c, as a function of the trigger particle pT up to 20 GeV/c and over the full centrality range. © 2012 CERN for the benefit of the CMS collaboration.
                    Cover page: Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at
                    • Article
                    • Peer Reviewed
                    UC Riverside Previously Published Works (2013)
                    A measurement of the inclusive WW+WZ diboson production cross section in proton-proton collisions is reported, based on events containing a leptonically decaying W boson and exactly two jets. The data sample, collected at [Formula: see text] with the CMS detector at the LHC, corresponds to an integrated luminosity of 5.0 fb-1. The measured value of the sum of the inclusive WW and WZ cross sections is σ(pp→WW+WZ)=68.9±8.7 (stat.)±9.7 (syst.)±1.5 (lum.) pb, consistent with the standard model prediction of 65.6±2.2 pb. This is the first measurement of WW+WZ production in pp collisions using this signature. No evidence for anomalous triple gauge couplings is found and upper limits are set on their magnitudes.
                      Cover page: Measurement of the sum of WW and WZ production with W+dijet events in pp collisions at [Formula: see text].
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