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1.
  • Abazov, V. M., et al. (författare)
  • Combined Search for the Standard Model Higgs Boson Decaying to b(b)over-bar Using the D0 Run II Data Set
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 109:12, s. 121802
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present the results of the combination of searches for the standard model Higgs boson produced in association with a W or Z boson and decaying into b (b) over bar using the data sample collected with the D0 detector in p (p) over bar collisions at root s = 1.96 TeV at the Fermilab Tevatron Collider. We derive 95% C.L. upper limits on the Higgs boson cross section relative to the standard model prediction in the mass range 100 GeV &lt;= M-H &lt;= 150 GeV, and we exclude Higgs bosons with masses smaller than 102 GeV at the 95% C.L. In the mass range 120 GeV &lt;= M-H &lt;= 145 GeV, the data exhibit an excess above the background prediction with a global significance of 1.5 standard deviations, consistent with the expectation in the presence of a standard model Higgs boson.</p>
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2.
  • Abazov, V. M., et al. (författare)
  • Measurement of angular correlations of jets at s=1.96 TeV and determination of the strong coupling at high momentum transfers
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 718:1, s. 56-63
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the average value of a new observable at hadron colliders that is sensitive to QCD dynamics and to the strong coupling constant, while being only weakly sensitive to parton distribution functions. The observable measures the angular correlations of jets and is defined as the number of neighboring jets above a given transverse momentum threshold which accompany a given jet within a given distance δR in the plane of rapidity and azimuthal angle. The ensemble average over all jets in an inclusive jet sample is measured and the results are presented as a function of transverse momentum of the inclusive jets, in different regions of δR and for different transverse momentum requirements for the neighboring jets. The measurement is based on a data set corresponding to an integrated luminosity of 0.7 fb -1 collected with the D0 detector at the Fermilab Tevatron Collider in pp- collisions at s=1.96 TeV. The results are well described by a perturbative QCD calculation in next-to-leading order in the strong coupling constant, corrected for non-perturbative effects. From these results, we extract the strong coupling and test the QCD predictions for its running over a range of momentum transfers of 50-400 GeV.</p>
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3.
  • Abazov, V. M., et al. (författare)
  • Measurement of leptonic asymmetries and top-quark polarization in t(t)over-bar production
  • 2013
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 87:1, s. 011103
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present measurements of lepton (l) angular distributions in top-quark (t) pair production and t (t) over bar -&gt; W(+)bW-(b) over bar -&gt; l(+) vbl-(v) over bar(b) over bar decays produced in p (p) over bar collisions at a center-of-mass energy of root s = 1.96 TeV, where l is an electron or muon. Using data corresponding to an integrated luminosity of 5.4 fb(-1), collected with the D0 detector at the Fermilab Tevatron Collider, we measure for the first time the leptonic forward-backward asymmetry in dilepton final states and obtain A(FB)(l) = (5.8 +/- 5.1(stat) +/- 1.3(syst))%, corrected for detector acceptance. This is compared to the standard model prediction of A(FB)(l)(predicted) = (4.7 +/- 0.1)%. A deviation from the standard model prediction as previously seen in a D0 measurement based on the analysis of the l + jets final state is not observed in these dilepton final states. The two results differ from each other by 1.4 standard deviations and are combined to obtain A(FB)(l) = (11.8 +/- 3.2)%. Furthermore, we present a first study of the top-quark polarization.</p>
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4.
  • Abazov, V. M., et al. (författare)
  • Measurement of the Semileptonic Charge Asymmetry using B-S(0) -&gt; D-s mu X Decays
  • 2013
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 110:1, s. 011801
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the time-integrated flavor-specific semileptonic charge asymmetry in the decays of B-s(0) mesons that have undergone flavor mixing, a(sl)(s), using B-s(0)((B) over bar (0)(s)) -&gt; D-s(-/+) mu(+/-) X decays, with D-s(-/+) -&gt; phi pi(-/+) and phi -&gt; K+K-, using 10.4 fb(-1) of proton-antiproton collisions collected by the D0 detector during Run II at the Fermilab Tevatron Collider. A fit to the difference between the time-integrated D0 detector during Run II at the Fermilab Tevatron Colllider. A fit to the difference between the time-integrated D-s(-) and D-s(+) mass distributions of the B-s(0) and ($) over bar (0)(s) candidates yields the flavor-specific asymmetry a(sl)(s) = [-1.12 +/- 0.74(stat) +/- 0.17(syst)]%, which is the most precise measurement and in agreement with the standard model prediction.</p>
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5.
  • Abazov, V. M., et al. (författare)
  • Measurement of the W boson mass with the D0 detector
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:1, s. 012005
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>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 -&gt; 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.</p>
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6.
  • Abazov, V. M., et al. (författare)
  • Search for Higgs boson production in oppositely charged dilepton and missing energy events in p(p)over-bar collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 86:3, s. 032010
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for the standard model Higgs boson using events with two oppositely charged leptons and large missing transverse energy as expected in H -&gt; WW decays. The events are selected from data corresponding to 8.6 fb(-1) of integrated luminosity in p (p) over bar collisions at root s = 1.96 TeV collected with the D0 detector at the Fermilab Tevatron Collider. No significant excess above the standard model background expectation in the Higgs boson mass range this search is sensitive to is observed, and upper limits on the Higgs boson production cross section are derived.</p>
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7.
  • Abazov, V. M., et al. (författare)
  • Search for the Standard Model Higgs Boson in Associated WH Production in 9.7 fb(-1) of p(p)over-bar Collisions with the D0 Detector
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 109:12, s. 121804
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for the standard model Higgs boson in final states with a charged lepton (electron or muon), missing transverse energy, and two or three jets, at least one of which is identified as a b-quark jet. The search is primarily sensitive to WH -&gt; lvb (b) over bar production and uses data corresponding to 9.7 fb(-1) of integrated luminosity collected with the D0 detector at the Fermilab Tevatron p (p) over bar Collider at root s = 1.96 TeV. We observe agreement between the data and the expected background. For a Higgs boson mass of 125 GeV, we set a 95% C.L. upper limit on the production of a standard model Higgs boson of 5.2 x sigma(SM), where sigma(SM) is the standard model Higgs boson production cross section, while the expected limit is 4: 7 x sigma(SM).</p>
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8.
  • Abazov, V. M., et al. (författare)
  • Search for the standard model Higgs boson in the ZH -&gt; nu(nu)over-barb(b)over-bar channel in 9.5 fb(-1) of p(p)over-bar collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 716:2, s. 285-293
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for the standard model Higgs boson in 9.5 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV collected with the D0 detector at the Fermilab Tevatron Collider. The final state considered contains a pair of b jets and is characterized by an imbalance in transverse energy, as expected from p (p) over bar -&gt; ZH -&gt; nu(nu) over barb (b) over bar production. The search is also sensitive to the WH -&gt; l nu b (b) over bar channel when the charged lepton is not identified. The data are found to be in good agreement with the expected background. For a Higgs boson mass of 125 GeV, we set a limit at the 95% C.L. on the cross section sigma(p (p) over bar -&gt; vertical bar Z/W vertical bar H), assuming standard model branching fractions, that is a factor of 4.3 times larger than the theoretical standard model value, while the expected factor is 3.9. The search is also used to measure a combined WZ and ZZ production cross section that is a factor of 0.94 +/- 0.31 (stat) +/- 0.34 (syst) times the standard model prediction of 4.4 pb, with an observed significance of 2.0 standard deviations. (C) 2012 Elsevier B.V. All rights reserved.</p>
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9.
  • Abazov, V. M., et al. (författare)
  • Search for the Standard Model Higgs Boson in ZH -&gt; l(+) l(-) b(b)over-bar Production with the D0 Detector in 9.7 fb(-1)of p(p)over-bar Collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 109:12, s. 121803
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for the standard model (SM) Higgs boson produced in association with a Z boson in 9.7 fb(-1) of p (p) over bar collisions collected with the D0 detector at the Fermilab Tevatron Collider at root s = 1.96 TeV. Selected events contain one reconstructed Z -&gt; e(+) e(-) or Z -&gt; mu(+) mu(-)candidate and at least two jets, including at least one jet identified as likely to contain a b quark. To validate the search procedure, we also measure the cross section for ZZ production in the same final state. It is found to be consistent with its SM prediction. We set upper limits on the ZH production cross section times branching ratio for H -&gt; b (b) over bar at the 95% C.L. for Higgs boson masses 90 &lt;= M-H &lt;= 150 GeV. The observed (expected) limit for M-H = 125 GeV is 7.1 (5.1) times the SM cross section.</p>
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10.
  • Abazov, V. M., et al. (författare)
  • Combination of searches for anomalous top quark couplings with 5.4 fb(-1) of p(p)over-bar collisions
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 713:3, s. 165-171
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present measurements of the tWb coupling form factors using information from electroweak single top quark production and from the helicity of W bosons from top quark decays in t (t) over bar events. We set upper limits on anomalous tWb coupling form factors using data collected with the DO detector at the Tevatron p (p) over bar collider corresponding to an integrated luminosity of 5.4 fb(-1).</p>
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