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1.
  • Abazov, V. M., et al. (författare)
  • Search for the standard model Higgs boson in the ZH -> 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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2.
  • Abazov, V. M., et al. (författare)
  • Measurement of the differential cross section d sigma/dt in elastic p(p)over-bar scattering at root s=1.96 TeV
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 86:1, s. 012009
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the elastic differential cross section dσ(pp̅ →pp̅ )/dt as a function of the four-momentum-transfer squared t. The data sample corresponds to an integrated luminosity of ≈31  nb<sup>-1</sup> collected with the D0 detector using dedicated Tevatron pp̅ Collider operating conditions at √s=1.96  TeV and covers the range 0.26&lt;|t|&lt;1.2  GeV<sup>2</sup>. For |t|&lt;0.6  GeV<sup>2</sup>, dσ/dt is described by an exponential function of the form Ae<sup>-b|t|</sup> with a slope parameter b=16.86±0.10(stat)±0.20(syst)  GeV<sup>-2</sup>. A change in slope is observed at |t|≈0.6  GeV<sup>2</sup>, followed by a more gradual |t| dependence with increasing values of |t|.</p>
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3.
  • Abazov, V. M., et al. (författare)
  • Measurement of the differential gamma plus c-jet cross section and the ratio of differential gamma plus c and gamma plus b cross sections in p(p)over-bar collisions at root s=1.96 TeV
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 719:4-5, s. 354-361
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present measurements of the differential cross section d sigma/dp(T)(gamma) for the associated production of a c-quark jet and an isolated photon with rapidity vertical bar y(gamma)vertical bar &lt; 1.0 and transverse momentum 30 &lt; p(T)(gamma) &lt; 300 GeV. The c-quark jets are required to have vertical bar y(jet)vertical bar &lt; 1.5 and p(T)(jet) &gt; 15 GeV. The ratio of differential cross sections for gamma + c to gamma + b production as a function of p(T)(gamma) is also presented. The results are based on data corresponding to an integrated luminosity of 8.7 fb(-1) recorded with the D0 detector at the Fermilab Tevatron p (p) over bar Collider at root s = 1.96 TeV. The obtained results are compared to next-to-leading order perturbative QCD calculations using various parton distribution functions, to predictions based on the k(T)-factorization approach, and to predictions from the SHERPA and PYTHIA Monte Carlo event generators. </p>
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4.
  • Abazov, V. M., et al. (författare)
  • Measurement of the photon plus b-jet production differential cross section in p(p)over-bar) collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 714:1, s. 32-39
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present measurements of the differential cross section d sigma/dp(T)(gamma) for the inclusive production of a photon in association with a b-quark jet for photons with rapidities vertical bar y(gamma)vertical bar &lt; 1.0 and 30 &lt; p(T)(gamma) &lt; 300 GeV, as well as for photons with 1.5 &lt; vertical bar y(gamma)vertical bar &lt; 2.5 and 30 &lt; p(T)(gamma) &lt; 200 GeV, where p(T)(gamma) is the photon transverse momentum. The b-quark jets are required to have p(T) &gt; 15 GeV and rapidity vertical bar Y-jet vertical bar &lt; 1.5. The results are based on data corresponding to an integrated luminosity of 8.7 fb(-1), recorded with the DO detector at the Fermilab Tevatron p&lt;(p)over bar&gt;) Collider at root s = 1.96 TeV. The measured cross sections are compared with next-to-leading order perturbative QCD calculations using different sets of parton distribution functions as well as to predictions based on the k(T)-factorization QCD approach, and those from the SHERPA and PYTHIA Monte Carlo event generators.</p>
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5.
  • Abazov, V. M., et al. (författare)
  • Measurement of the ratio of three-jet to two-jet cross sections in p(p)over-bar collisions at root s=1.96 TeV
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 720:1-3, s. 6-12
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the ratio of multijet cross sections in p (p) over barp collisions at root s = 1.96 TeV at the Fermilab Tevatron Collider. The measurement is based on a data set corresponding to an integrated luminosity of 0.7 fb(-1) collected with the DO detector. The ratio of the inclusive three-jet to two-jet cross sections, R-3/2, has been measured as a function of the jet transverse momenta. The data are compared to QCD predictions in different approximations. Popular tunes of the PYriiiA event generator do not agree with the data, while SHERPA provides a reasonable description of the data. A perturbative QCD prediction in next-to-leading order in the strong coupling constant, corrected for non-perturbative effects, gives a good description of the data.</p>
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6.
  • Abazov, V. M., et al. (författare)
  • Search for the standard model Higgs boson in tau lepton final states D0 Collaboration
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 714:2-5, s. 237-245
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for the standard model Higgs boson in final states with an electron or muon and a hadronically decaying tau lepton in association with zero, one, or two or more jets using data corresponding to an integrated luminosity of up to 7.3 fb(-1) collected with the D0 detector at the Fermilab Tevatron collider. The analysis is sensitive to Higgs boson production via gluon-gluon fusion, associated vector boson production, and vector boson fusion, and to Higgs boson decays to tau tau, WW, ZZ and b (b) over bar pairs. Observed (expected) limits are set on the ratio of 95% C.L. upper limits on the cross section times branching ratio, relative to those predicted by the Standard Model, of 22 (14) at a Higgs boson mass of 115 GeV and 6.8 (7.7) at 165 GeV.</p>
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7.
  • Abazov, V. M., et al. (författare)
  • Combined search for the Higgs boson with the D0 experiment
  • 2013
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 88:5, s. 052011
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We perform a combination of searches for standard model Higgs boson production in p (p) over bar collisions recorded by the D0 detector at the Fermilab Tevatron Collider at a center of mass energy of root s = 1.96 TeV. The different production and decay channels have been analyzed separately, with integrated luminosities of up to 9.7 fb(-1) and for Higgs boson masses 90 &lt;= M-H &lt;= 200 GeV. We combine these final states to achieve optimal sensitivity to the production of the Higgs boson. We also interpret the combination in terms of models with a fourth generation of fermions, and models with suppressed Higgs boson couplings to fermions. The result excludes a standard model Higgs boson at 95% C.L. in the ranges 90 &lt; M-H &lt; 101 GeV and 157 &lt; M-H &lt; 178 GeV, with an expected exclusion of 155 &lt; M-H &lt; 175 GeV. In the range 120 &lt; M-H &lt; 145 GeV, the data exhibit an excess over the expected background of up to 2 standard deviations, consistent with the presence of a standard model Higgs boson of mass 125 GeV.</p>
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8.
  • Abazov, V. M., et al. (författare)
  • Limits on anomalous trilinear gauge boson couplings from WW, WZ and Wγ production in pp- collisions at √s=1.96TeV
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 718:2, s. 451-459
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present searches for the anomalous γWW and ZWW trilinear gauge boson couplings from WW and WZ production using lepton plus dijet final states and a combination with results from Wγ, WW, and WZ production with leptonic final states. The analyzed data correspond to up to 8.6fb -1 of integrated luminosity collected by the D0 detector in pp- collisions at s=1.96TeV. We set the most stringent limits at a hadron collider to date assuming two different relations between the anomalous coupling parameters δκ γ, λ, and δg1Z for a cutoff energy scale Λ=2TeV. The combined 68% C.L. limits are -0.057&amp;lt;δκ γ&amp;lt;0.154, -0.015&amp;lt;λ&amp;lt;0.028, and -0.008&amp;lt;δg1Z&amp;lt;0.054 for the LEP parameterization, and -0.007&amp;lt;δκ&amp;lt;0.081 and -0.017&amp;lt;λ&amp;lt;0.028 for the equal couplings parameterization. We also present the most stringent limits of the W boson magnetic dipole and electric quadrupole moments.</p>
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9.
  • Abazov, V. M., et al. (författare)
  • Measurement of the asymmetry in angular distributions of leptons produced in dilepton t(t)over-bar final states in p(p)over-bar collisions at root s=1.96 TeV
  • 2013
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 88:11, s. 112002
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present measurements of asymmetries in angular distributions of leptons produced in t (t) over bar events in proton-antiproton collisions at the Fermilab Tevatron Collider. We consider final states where the W-+/- bosons from top quark and antiquark decays both decay into l nu (l = e, mu) resulting in oppositely charged dilepton final states with accompanying jets. Using 9.7 fb(-1) of integrated luminosity collected with the D0 detector, we find the asymmetries in lepton pseudorapidity compatible with predictions based on the standard model.</p>
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10.
  • Abazov, V. M., et al. (författare)
  • Measurement of the differential cross sections for isolated direct photon pair production in p(p)over-bar collisions at root s=1.96 TeV
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 725:1-3, s. 6-14
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present measurements of direct photon pair production cross sections using 8.5 fb(-1) of data collected with the D0 detector at the Fermilab Tevatron p (p) over bar collider. The results are presented as differential distributions of the photon pair invariant mass d sigma/dM(gamma gamma), pair transverse momentum d sigma/dp(T)(gamma gamma) azimuthal angle between the photons d sigma/d Delta(phi)(gamma gamma), and polar scattering angle in the Collins-Soper frame d sigma/d vertical bar cos theta*vertical bar. Measurements are performed for isolated photons with transverse momenta p(T)(gamma) &gt; 18 (17) GeV for the leading (next-to-leading) photon in P-T, pseudorapidities vertical bar eta(gamma)vertical bar &lt; 0.9, and a separation in eta-phi space Delta R-gamma gamma &gt; 0.4. We present comparisons with the predictions from Monte Carlo event generators DIPHOX and RESBOS implementing QCD calculations at next-to-leading order, 2 gamma NNLO at next-to-next-to-leading order, and SHERPA using matrix elements with higher-order real emissions matched to parton shower. </p>
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