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51.
  • Abazov, V. M., et al. (författare)
  • Search for associated Higgs boson production using like charge dilepton events in p(p)over-bar collisions at root s=1.96 TeV
  • 2011
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 84:9, s. 092002
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for associated Higgs boson production in the process p (p) over bar -&gt; W/ZH -&gt; l(+/-)l'(+/-) + X in ee, e mu, and mu mu final states. The search is based on data collected by the D0 experiment at the Fermilab Tevatron Collider at root s = 1.96 TeV corresponding to 5.3 fb(-1) of integrated luminosity. We require two isolated leptons (electrons or muons) with the same electric charge and additional kinematic requirements. No significant excess above background is observed, and we set 95% C. L. observed (expected) upper limits on ratio of the production cross section to the standard model prediction of 6.4 (7.3) for a Higgs boson mass of 165 GeV and 13.5 (19.8) for a mass of 115 GeV.</p>
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52.
  • Abazov, V. M., et al. (författare)
  • Search for Diphoton Events with Large Missing Transverse Energy in 6.3 fb(-1) of p(p)over-bar Collisions at root s=1.96 TeV
  • 2010
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 105:22, s. 221802
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report a search for diphoton events with large missing transverse energy produced in p (p) over bar collisions at root s = 1.96 TeV. The data were collected with the D0 detector at the Fermilab Tevatron Collider and correspond to 6.3 fb(-1) of integrated luminosity. The observed missing transverse energy distribution is well described by the standard model prediction, and 95% C.L. limits are derived on two realizations of theories beyond the standard model. In a gauge-mediated supersymmetry breaking scenario, the breaking scale Lambda is excluded for Lambda &lt; 124 TeV. In a universal extra dimension model including gravitational decays, the compactification radius R-c is excluded for R-c(-1) &lt; 477 GeV.</p>
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53.
  • Abazov, V. M., et al. (författare)
  • Search for Doubly Charged Higgs Boson Pair Production in p(p)over-bar Collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 108:2, s. 021801
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for pair production of doubly charged Higgs bosons in the processes q (q) over bar -&gt; H(++)H(--) decaying through H(+/-+/-) -&gt;tau(+/-)tau(+/-), mu(+/-)tau(+/-), mu(+/-)mu(+/-). The search is performed in p (p) over bar collisions at a center-of-mass energy of root s = 1:96 TeV using an integrated luminosity of up to 7:0 fb(-1) collected by the D0 experiment at the Fermilab Tevatron Collider. The results are used to set 95% C. L. limits on the pair production cross section of doubly charged Higgs bosons and on their mass for different H(+/-+/-) branching fractions. Models predicting different H(+/-+/-) decays are investigated. Assuming B(H(+/-+/-) -&gt; tau(+/-)tau(+/-)) = 1 yields an observed (expected) lower limit on the mass of a left- handed H(L)(+/-+/-) boson of 128 (116) GeV and assuming B(H(+/-+/-) -&gt; mu(+/-)tau(+/-)) = 1 the corresponding limits are 144 (149) GeV. In a model with B(H(+/-+/-) -&gt; tau +/-tau(+/-) B(H(+/-+/-) -&gt; mu(+/-)tau(+/-)) = B(H(+/-+/-) -&gt; mu(+/-)mu(+/-) ) 1/3, we obtain M(H(L)(+/-+/-)) &gt; 130 (138) GeV.</p>
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54.
  • Abazov, V. M., et al. (författare)
  • Search for Events with Leptonic Jets and Missing Transverse Energy in p(p)over-bar Collisions at root s=1.96 TeV
  • 2010
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 105:21, s. 211802
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present the first search for pair production of isolated jets of charged leptons in association with a large imbalance in transverse energy in p (p) over bar collisions using 5: 8 fb(-1) of integrated luminosity collected by the D0 detector at the Fermilab Tevatron Collider. No excess is observed above the standard model background, and the result is used to set upper limits on the production cross section of pairs of supersymmetric chargino and neutralino particles as a function of "dark-photon'' mass, where the dark photon is produced in the decay of the lightest supersymmetric particle.</p>
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55.
  • Abazov, V. M., et al. (författare)
  • Search for first generation leptoquark pair production in the electron plus missing energy plus jets final state
  • 2011
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 84:7, s. 071104
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for the pair production of first generation scalar leptoquarks (LQ) in data corresponding to an integrated luminosity of 5.4 fb(-1) collected with the D0 detector at the Fermilab Tevatron Collider in p (p) over bar collisions at root s = 1.96 TeV. In the channel LQLQ -&gt; eqv(e)q', where q, q' are u or d quarks, no significant excess of data over background is observed, and we set a 95% C. L. lower limit of 326 GeV on the LQ mass, assuming equal probabilities of LQ decays to eq and v(e)q'.</p>
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56.
  • Abazov, V. M., et al. (författare)
  • Search for flavor changing neutral currents in decays of top quarks
  • 2011
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 701:3, s. 313-320
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for flavor changing neutral currents in decays of top quarks. The analysis is based on a search for <img src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-532WDNB-3-2/0?wchp=dGLbVzW-zSkWb" /> (<em>ℓ</em>,<em>ℓ</em><sup>′</sup>=<em>e</em>,<em>μ</em>) final states using 4.1 fb<sup>−1</sup> of integrated luminosity of <img src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-532WDNB-3-6X/0?wchp=dGLbVzW-zSkWb" /> collisions at <img src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TVN-532WDNB-3-79/0?wchp=dGLbVzW-zSkWb" />. We extract limits on the branching ratio <em>B</em>(<em>t</em>→<em>Z</em><em>q</em>) (<em>q</em>=<em>u</em>,<em>c</em> quarks), assuming anomalous <em>tuZ</em> or <em>tcZ</em> couplings. We do not observe any sign of such anomalous coupling and set a limit of <em>B</em>&lt;3.2% at 95% C.L.</p>
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57.
  • Abazov, V. M., et al. (författare)
  • Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb(-1) of p(p)over-bar collisions
  • 2010
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 693:2, s. 81-87
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for flavor changing neutral currents via quark-gluon couplings in a sample of single top quark final states corresponding to 2.3 fb(-1) of integrated luminosity collected with the DO detector at the Fermilab Tevatron Collider. We select events containing a single top quark candidates with an additional jet, and obtain separation between signal and background using Bayesian neural networks. We find consistency between background expectation and observed data, and set limits on flavor changing neutral current gluon couplings of the top quark to up quarks (tgu) and charm quarks (tgc). The cross section limits at the 95% C.L. are sigma(tgu) &lt; 0.20 pb and sigma(tgc) &lt; 0.27 pb. These correspond to limits on the top quark decay branching fractions of B(t -&gt; gu) &lt; 2.0 x 10(-4) and B(t -&gt; gc) &lt; 3.9 x 10(-3).</p>
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58.
  • Abazov, V. M., et al. (författare)
  • Search for Higgs bosons decaying to tau(+)tau(-) pairs in p(p)over-bar collisions at root s=1.96 TeV
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 707:3-4, s. 323-329
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for the production of neutral Higgs bosons decaying into tau(+)tau(-) pairs in p (p) over bar collisions at a center-of-mass energy of 1.96 TeV. The data, corresponding to an integrated luminosity of 5.4 fb(-1), were collected by the DO experiment at the Fermilab Tevatron Collider. We set upper limits at the 95% C.L. on the product of production cross section and branching ratio for a scalar resonance decaying into tau(+)tau(-) pairs, and we interpret these limits as limits on the production of Higgs bosons in the minimal supersymmetric standard model (MSSM) and as constraints in the MSSM parameter space.</p>
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59.
  • Abazov, V. M., et al. (författare)
  • Search for Neutral Minimal Supersymmetric Standard Model Higgs Bosons Decaying to Tau Pairs Produced in Association with b Quarks in p(p)over-bar Collisions at root s=1.96 TeV
  • 2011
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 107:12, s. 121801
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report results from a search for neutral Higgs bosons produced in association with b quarks using data recorded by the D0 experiment at the Fermilab Tevatron Collider and corresponding to an integrated luminosity of 7.3 fb(-1). This production mode can be enhanced in several extensions of the standard model (SM) such as in its minimal supersymmetric extension (MSSM) at high tan beta. We search for Higgs bosons decaying to tau pairs with one tau decaying to a muon and neutrinos and the other to hadrons. The data are found to be consistent with SM expectations, and we set upper limits on the cross section times branching ratio in the Higgs boson mass range from 90 to 320 GeV/c(2). We interpret our result in the MSSM parameter space, excluding tan beta values down to 25 for Higgs boson masses below 170 GeV/c(2).</p>
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60.
  • Abazov, V. M., et al. (författare)
  • Search for New Fermions ("Quirks'') at the Fermilab Tevatron Collider
  • 2010
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 105:21, s. 211803
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report results of a search for particles with anomalously high ionization in events with a high transverse energy jet and large missing transverse energy in 2: 4 fb(-1) of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron p (p) over bar collider. Production of such particles (quirks) is expected in scenarios with extra QCD-like SU(N) sectors, and this study is the first dedicated search for such signatures. We find no evidence of a signal and set a lower mass limit of 107, 119, and 133 GeV for the mass of a charged quirk with strong dynamics scale Lambda in the range from 10 keV to 1 MeV and N = 2, 3, and 5, respectively.</p>
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