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1.
  • Abazov, V. M., et al. (författare)
  • Measurement of the W boson mass with the D0 detector
  • 2014
  • Ingår i: Physical Review D. - 1550-7998. ; 89:1, s. 012005
  • Tidskriftsartikel (refereegranskat)abstract
    • We give a detailed description of the measurement of the W boson mass, M-W, performed on an integrated luminosity of 4.3 fb(-1), which is based on similar techniques as used for our previous measurement done on an independent data set of 1 fb(-1) of data. The data were collected using the D0 detector at the Fermilab Tevatron Collider. This data set yields 1.68 x 10(6) W -> ev candidate events. We measure the mass using the transverse mass, electron transverse momentum, and missing transverse energy distributions. The M-W measurements using the transverse mass and the electron transverse momentum distributions are the most precise of these three and are combined to give M-W 80.367 +/- 0.013 (stat) +/- 0.022(syst) GeV = 80: 367 +/- 0.026 GeV. When combined with our earlier measurement on 1 fb(-1) of data, we obtain M-W = 80.375 +/- 0.023 GeV.
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2.
  • Abazov, V. M., et al. (författare)
  • Measurement of the Direct CP-violating Charge Asymmetry in D-s(+/-) -> Phi pi(+/-) Decays
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007. ; 112:11, s. 111804
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a measurement of the direct CP-violating charge asymmetry in D-s(+) -> phi pi(+/-) decays where the phi meson decays to K+ K-, using the full Run II data set with an integrated luminosity of 10.4 fb(-1) of proton- antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. The normalized difference A(CP) in the yield of D-s(+) and D-s(-) mesons in these decays is measured by fitting the difference between their reconstructed invariant mass distributions. This results in an asymmetry of A(CP) = [-0.38 +/- 0.27]%, which is the most precise measurement of this quantity to date. The result is consistent with the standard model prediction of zero CP asymmetry in this decay.
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3.
  • Abazov, V. M., et al. (författare)
  • Measurement of the muon charge asymmetry in p(p)over-bar -> W + X -> mu nu + X events at root s=1.96 TeV
  • 2013
  • Ingår i: Physical Review D. - 1550-7998. ; 88:9, s. 091102
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a measurement of the muon charge asymmetry from the decay of the W boson via W -> mu nu using 7: 3 fb(-1) of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider at root s = 1.96 TeV. The muon charge asymmetry is presented in two kinematic regions in muon transverse momentum and event missing transverse energy: (p(T)(mu) > 25 GeV, E-T > 25 GeV) and (p(T)(mu) > 35 GeV, E-T > 35 GeV). The measured asymmetries are compared with theory predictions made using three parton distribution function sets. The data at p(T)(mu) > 35 GeV, E-T > 35 GeV, and larger values of vertical bar eta(mu)vertical bar favor an increased d(x)/u(x) ratio at higher values of x than is predicted.
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4.
  • Abazov, V. M., et al. (författare)
  • Measurement of the W Boson Production Charge Asymmetry in p(p)over-bar -> W plus X -> ev plus X Events at root s=1.96 Tev
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007. ; 112:15, s. 151803
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a measurement of the W boson production charge asymmetry in p (p) over bar -> W + X -> ev + X events at a center of mass energy of 1.96 TeV, using 9.7 fb(-1) of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. The neutrino longitudinal momentum is determined by using a neutrino weighting method, and the asymmetry is measured as a function of the W boson rapidity. The measurement extends over wider electron pseudorapidity region than previous results and is the most precise to date, allowing for precise determination of proton parton distribution functions in global fits.
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5.
  • Abazov, V. M., et al. (författare)
  • Search for the X(4140) state in B+ -> J/psi phi K+ decays with the D0 detector
  • 2014
  • Ingår i: Physical Review D. - 1550-7998. ; 89:1, s. 012004
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate the decay B+ -> J/psi phi K+ in a search for the X(4140) state, a narrow threshold resonance in the J/psi phi system. The data sample corresponds to an integrated luminosity of 10.4 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider. We observe a mass peak with a statistical significance of 3.1 standard deviations and measure its invariant mass to be M = 4159.0 +/- 4.3(stat) +/- 6.6(syst) MeV and its width to be Gamma = 19.9 +/- 12.6(stat)(-8.0)(+3.0)(syst) MeV.
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6.
  • Abazov, V. M., et al. (författare)
  • Study of CP-violating charge asymmetries of single muons and like-sign dimuons in p(p)over-bar collisions
  • 2014
  • Ingår i: Physical Review D. - 1550-7998. ; 89:1, s. 012002
  • Tidskriftsartikel (refereegranskat)abstract
    • We measure the inclusive single muon charge asymmetry and the like-sign dimuon charge asymmetry in p (p) over bar collisions using the full data set of 10.4 fb(-1) collected with the D0 detector at the Fermilab Tevatron. The standard model predictions of the charge asymmetries induced by CP violation are small in magnitude compared to the current experimental precision, so nonzero measurements could indicate new sources of CP violation. The measurements differ from the standard model predictions of CP violation in these asymmetries with a significance of 3.6 standard deviations. These results are interpreted in a framework of B meson mixing within the Cabibbo-Kobayashi-Maskawa formalism to measure the relative width difference Delta Gamma(d)/Gamma(d) between the mass eigenstates of the B-0 meson system and the semileptonic charge asymmetries a(sl)(d) and a(sl)(s) of B-0 and B-s(0) mesons, respectively.
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7.
  • Abazov, V. M., et al. (författare)
  • Double parton interactions in gamma+3 jet and gamma plus b/c jet+2 jet events in p(p)over-bar collisions at root s=1.96 TeV
  • 2014
  • Ingår i: Physical Review D. - 1550-7998. ; 89:7, s. 072006
  • Tidskriftsartikel (refereegranskat)abstract
    • We determine the fraction of events with double parton (DP) Scattering in a single p (p) over bar collisions at root s = 1.96 TeV in gamma + 3 jet and gamma + b/c jet + 2 jet events collected with the D0 detector and corresponding to an integrated luminosity of about 8.7 fb(-1). The DP fractions and effective cross sections (sigma(eff)) are measured for both event samples using the same kinematic selections. The measured DP fractions range from 0.21 to 0.17, with effective cross sections in the gamma + 3 jet and gamma + b/cjet + 2 jet samples of sigma(incl)(eff) = 12.7 +/- 0.2(stat) +/- 1.3(syst) mb and sigma(HF)(eff) = 14.6 +/- 0.6(stat) +/- 3.2(syst) mb, respectively.
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8.
  • Abazov, V. M., et al. (författare)
  • Electron and photon identification in the Do experiment
  • 2014
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. - 0168-9002. ; 750, s. 78-95
  • Tidskriftsartikel (refereegranskat)abstract
    • The electron and photon reconstruction and identification algorithms used by the DO Collaboration at the Fermilab Tevatron collider are described. The determination of the electron energy scale and resolution is presented. Studies of the performance of the electron and photon reconstruction and identification are summarized. The results are based on measurements of Z boson decay events of Z ee and Z gamma ll(i=e mu) collected in pp(over bar) collisions at a center- of- mass energy of 1.96 TeV using an integrated luminosity of up to10 fb(-1.)
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9.
  • Abazov, V. M., et al. (författare)
  • Evidence for production of single top quarks
  • 2008
  • Ingår i: Physical Review D. - 1550-7998. ; 78:1, s. 012005
  • Forskningsöversikt (övrigt vetenskapligt)abstract
    • We present first evidence for the production of single top quarks in the D0 detector at the Fermilab Tevatron p (p) over bar collider. The standard model predicts that the electroweak interaction can produce a top quark together with an antibottom quark or light quark, without the antiparticle top-quark partner that is always produced from strong-coupling processes. Top quarks were first observed in pair production in 1995, and since then, single top-quark production has been searched for in ever larger data sets. In this analysis, we select events from a 0.9 fb(-1) data set that have an electron or muon and missing transverse energy from the decay of a W boson from the top-quark decay, and two, three, or four jets, with one or two of the jets identified as originating from a b hadron decay. The selected events are mostly backgrounds such as W + jets and t (t) over bar events, which we separate from the expected signals using three multivariate analysis techniques: boosted decision trees, Bayesian neural networks, and matrix-element calculations. A binned likelihood fit of the signal cross section plus background to the data from the combination of the results from the three analysis methods gives a cross section for single top-quark production of sigma(p (p) over bar -> tb + X, tqb + X) = 4.7 +/- 1.3 pb. The probability to measure a cross section at this value or higher in the absence of signal is 0.014%, corresponding to a 3.6 standard deviation significance. The measured cross section value is compatible at the 10% level with the standard model prediction for electroweak top-quark production. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa quark mixing matrix element that describes the Wtb coupling and find vertical bar V(tb)f(1)(L)vertical bar = 1.31(-0.21)(+0.25), where f(1)(L) is a generic vector coupling. This model-independent measurement translates into 0.68 <= 1 at the 95% C.L. in the standard model.
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10.
  • Abazov, V. M., et al. (författare)
  • Evidence for s-channel single top quark production in p(p)over-bar collisions at root s=1.96 TeV
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693. ; 726:4-5, s. 656-664
  • Tidskriftsartikel (refereegranskat)abstract
    • We present measurements of the cross sections for the two main production modes of single top quarks in p (p) over bar collisions at root s = 1.96 TeV in the Run II data collected with the DO detector at the Fermilab Tevatron Collider, corresponding to an integrated luminosity of 9.7 fb(-1). The s-channel cross section is measured to be sigma(p (p) over bar -> tb + X) = 1.10(-0.31)(+0.33) pb with no assumptions on the value of the t-channel cross section. Similarly, the t-channel cross section is measured to be sigma(p (p) over bar -> tqb + X) = 3.07(-0.49)(+0.54) pb. We also measure the s + t combined cross section as sigma(p (p) over bar -> tb + X, tqb + X) = 4.11(-0.55)(+0.60) ph and set a lower limit on the CKM matrix element vertical bar V-tb vertical bar> 0.92 at 95% C.L., assuming mt = 172.5 GeV. The probability to measure a cross section for the s channel at the observed value or higher in the absence of signal is 1.0 x 10(-4), corresponding to a significance of 3.7 standard deviations. 
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