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1.
  • Abazov, V. M., et al. (författare)
  • Measurement of the inclusive jet cross section in p(p)over-bar collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 85:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the inclusive jet cross section using the Run II cone algorithm and data collected by the D0 experiment in p (p) over bar collisions at a center-of-mass energy root s = 1.96 TeV, corresponding to an integrated luminosity of 0: 70 fb(-1). The jet energy calibration and the method used to extract the inclusive jet cross section are described. We discuss the main uncertainties, which are dominated by the jet energy scale uncertainty. The results cover jet transverse momenta from 50 GeV to 600 GeV with jet rapidities in the range -2.4 to 2.4 and are compared to predictions using recent proton parton distribution functions. Studies of correlations between systematic uncertainties in transverse momentum and rapidity are presented.</p>
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2.
  • Abazov, V. M., et al. (författare)
  • Evidence for Spin Correlation in t(t)over-bar Production
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 108:3, s. 032004
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the ratio of events with correlated t and (t) over bar spins to the total number of t (t) over bar events. This ratio f is evaluated using a matrix-element-based approach in 729 t (t) over bar candidate events with a single lepton l (electron or muon) and at least four jets. The analyzed p (p) over bar collisions data correspond to an integrated luminosity of 5: 3 fb(-1) and were collected with the D0 detector at the Fermilab Tevatron collider operating at a center-of-mass energy root s = 1.96 TeV. Combining this result with a recent measurement of f in dileptonic final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in t (t) over bar events with a significance of more than 3 standard deviations.</p>
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3.
  • Abazov, V. M., et al. (författare)
  • Measurement of the CP-violating phase phi sJ/psi phi using the flavor-tagged decay Bs(0) -&gt; J/psi phi in 8 fb(-1) of p(p)over-bar collisions
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 85:3, s. 032006
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report an updated measurement of the CP-violating phase, phi(J/psi phi)(s), and the decay-width difference for the two mass eigenstates, Delta Gamma(s), from the flavor-tagged decay B-s(0) -&gt; J/psi phi. The data sample corresponds to an integrated luminosity of 8.0 fb(-1) accumulated with the D0 detector using p (p) over bar collisions at root s = 1.96 TeV produced at the Fermilab Tevatron collider. The 68% Bayesian credibility intervals, including systematic uncertainties, are Delta Gamma(s) = 0.163(-0.064)(+0.065) ps(-1) and phi(J/psi phi)(s) = -0.55(-0.36)(+0.38). The p-value for the Standard Model point is 29.8%.</p>
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4.
  • Abazov, V. M., et al. (författare)
  • Measurement of the relative branching ratio of B-s(0) -&gt; J/psi f(0)(980) to B-s(0) -&gt; J/psi phi
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 85:1, s. 011103
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the relative branching fraction, R-f0/phi, of B-s(0) -&gt; J/psi f(0)(980), with f(0)(980) -&gt; pi(+)pi(-), to the process B-s(0) -&gt; J/psi phi, with phi -&gt; K+K-. The J/psi f(0)(980) final state corresponds to a CP-odd eigenstate of B-s(0) that could be of interest in future studies of CP violation. Using 8 fb(-1) of data recorded with the D0 detector at the Fermilab Tevatron Collider, we find R-f0/phi = 0.275 +/- 0.041(stat) +/- 0.061(syst).</p>
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5.
  • Abazov, V. M., et al. (författare)
  • Measurements of WW and WZ Production in W plus jets Final States in p(p)over-bar Collisions
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 108:18, s. 181803
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We study WW and WZ production with lvqq (l = e, mu) final states using data collected by the D0 detector at the Fermilab Tevatron Collider corresponding to 4.3 fb(-1) of integrated luminosity from p (p) over bar collisions at root s = 1.96 TeV. Assuming the ratio between the production cross sections sigma(WW) and sigma(WZ) as predicted by the standard model, we measure the total WV (V = W, Z) cross section to be sigma(WV) = 19.6(-3.0)(+3.2) pb and reject the background-only hypothesis at a level of 7.9 standard deviations. We also use b-jet discrimination to separate the WZ component from the dominant WW component. Simultaneously fitting WW and WZ contributions, we measure sigma(WW) = 15.9(-3.2)(+3.7) pb and sigma(WZ) = 3.3(-3.3)(+4.1) pb, which is consistent with the standard model predictions.</p>
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6.
  • Abazov, V. M., et al. (författare)
  • Search for a narrow t(t)over-bar resonance in p(p)over-bar collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 85:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report a search for a narrow t (t) over bar resonance that decays into a lepton + jets final state based on an integrated luminosity of 5.3 fb(-1) of proton-antiproton collisions at root s = 1.96 TeV collected by the D0 Collaboration at the Fermilab Tevatron Collider. We set upper limits on the production cross section of such a resonance multiplied by its branching fraction to t (t) over bar. We exclude a leptophobic topcolor Z' at the 95% confidence level for masses below 835 GeV (940 GeV) if its width is 1.2% (3%) of its mass. We also exclude color octet vector bosons (colorons) with masses below 775 GeV.</p>
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7.
  • Abazov, V. M., et al. (författare)
  • Search for anomalous Wtb couplings in single top quark production in p(p)over-bar collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 708:1-2, s. 21-26
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present new direct constraints on a general Wtb interaction using data corresponding to an integrated luminosity of 5.4 fb(-1) collected by the DO detector at the Tevatron p (p) over bar collider. The standard model provides a purely left-handed vector coupling at the Wtb vertex, while the most general, lowest dimension Lagrangian allows right-handed vector and left- or right-handed tensor couplings as well. We obtain precise limits on these anomalous couplings by comparing the data to the expectations from different assumptions on the Wtb coupling.</p>
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8.
  • Abazov, V. M., et al. (författare)
  • Search for Charged Massive Long-Lived Particles
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 108:12, s. 121802
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report on a search for charged massive long-lived particles (CMLLPs), based on 5.2 fb(-1) of integrated luminosity collected with the D0 detector at the Fermilab Tevatron p (p) over bar collider. We search for events in which one or more particles are reconstructed as muons but have speed and ionization energy loss (dE/dx) inconsistent with muons produced in beam collisions. CMLLPs are predicted in several theories of physics beyond the standard model. We exclude pair-produced long-lived gauginolike charginos below 267 GeV and Higgsino-like charginos below 217 GeV at 95% C.L., as well as long-lived scalar top quarks with mass below 285 GeV.</p>
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9.
  • Abazov, V. M., et al. (författare)
  • Z(gamma) production and limits on anomalous ZZ(gamma) and Z(gamma gamma) couplings in p(p)over-bar collisions at root s 1.96 TeV
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 85:5, s. 052001
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of p (p) over bar -&gt; Z gamma -&gt; l(+)l(-)gamma (l = e, mu) production with a data sample corresponding to an integrated luminosity of 6.2 fb(-1) collected by the D0 detector at the Fermilab Tevatron p (p) over bar Collider. The results of the electron and muon channels are combined, and we measure the total production cross section and the differential cross section d(sigma)/dp(T)(gamma), where p(T)(gamma) is the momentum of the photon in the plane transverse to the beam line. The results obtained are consistent with the standard model predictions from next-to-leading order calculations. We use the transverse momentum spectrum of the photon to place limits on anomalous ZZ gamma and Z gamma gamma couplings.</p>
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10.
  • Aaltonen, T., et al. (författare)
  • Combination of Tevatron Searches for the Standard Model Higgs Boson in the W+W- Decay Mode
  • 2010
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 104:6, s. 061802
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We combine searches by the CDF and D0 Collaborations for a Higgs boson decaying to W+W-. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb(-1) of p (p) over bar collisions at root s = 1.96 TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard model Higgs boson in the mass range 162-166 GeV at the 95% C.L.</p>
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