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1.
  • Abe, K., et al. (författare)
  • J-PARC Neutrino Beamline Upgrade Technical Design Report
  • 2019
  • Rapport (refereegranskat)abstract
    • <p>In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data corresponding to 2×10<sup>22</sup> protons-on-target in the next decade, aiming at an initial observation of CP violation with 3σ or higher significance in the case of maximal CP violation. Methods to increase the neutrino beam intensity, which are necessary to achieve the proposed data increase, are described.</p>
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2.
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3.
  • Abazov, V. M., et al. (författare)
  • Search for the rare decay B-s(0)-&gt;phi mu(+)mu(-) with the D0 detector
  • 2006
  • Ingår i: Physical Review D - Particles, Fields, Gravitation and Cosmology. - 1550-7998. ; 74:3, s. 031107
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a search for the flavor-changing neutral current decay B-s(0)-&gt;phi mu(+)mu(-) using about 0.45 fb(-1) of data collected in p (p) over bar collisions at root s=1.96 TeV with the D0 detector at the Fermilab Tevatron Collider. We find an upper limit on the branching ratio of this decay normalized to B-s(0)-&gt; J/psi phi of B(B-s(0)-&gt;phi mu(+)mu(-))/B(B-s(0)-&gt; J/psi phi)&lt; 4.4x10(-3) at the 95% C.L. Using the central value of the world average branching fraction of B-s(0)-&gt; J/psi phi, the limit corresponds to B(B-s(0)-&gt;phi mu(+)mu(-))&lt; 4.1x10(-6) at the 95% C.L., the most stringent upper bound to date.</p>
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4.
  • Abazov, V. M., et al. (författare)
  • Experimental discrimination between charge 2e/3 top quark and charge 4e/3 exotic quark production scenarios
  • 2007
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 98:4, s. 041801
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present the first experimental discrimination between the 2e/3 and 4e/3 top quark electric charge scenarios, using top quark pairs (t (t) over bar) produced in p (p) over bar collisions at root s =1.96 TeV by the Fermilab Tevatron Collider. We use 370 pb(-1) of data collected by the D0 experiment and select events with at least one high transverse momentum electron or muon, high transverse energy imbalance, and four or more jets. We discriminate between b- and (b) over bar -quark jets by using the charge and momenta of tracks within the jet cones. The data are consistent with the expected electric charge, |q|=2e/3. We exclude, at the 92% C.L., that the sample is solely due to the production of exotic quark pairs Q (Q) over bar with |q|=4e/3. We place an upper limit on the fraction of Q (Q) over bar pairs rho &lt; 0.80 at the 90% C.L.</p>
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5.
  • Abazov, V. M., et al. (författare)
  • Limits on anomalous trilinear gauge couplings from WW -&gt; e(+)e(-), WW -&gt; e(+/-)mu(-/+), and WW -&gt;mu(+)mu(-) events from pp collisions at root s=1.96 TeV
  • 2006
  • Ingår i: Physical Review D - Particles, Fields, Gravitation and Cosmology. - 1550-7998. ; 74:5, s. 057101
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Limits are set on anomalous WW gamma and WWZ trilinear gauge couplings using W+W--&gt; e(+)nu(e)e(-)(nu) over bar (e), W+W--&gt; e(+/-)nu(e)mu(-/+)nu(mu), and W+W--&gt;mu(+)nu(mu)mu(-)(nu) over bar (mu) events. The data set was collected by the Run II D0 detector at the Fermilab Tevatron Collider and corresponds to approximately 250 pb(-1) of integrated luminosity at root s=1.96 TeV. Under the assumption that the WW gamma couplings are equal to the WWZ couplings and using a form factor scale of Lambda=2.0 TeV, the combined 95% C.L. one-dimensional coupling limits from all three channels are -0.32 &lt;Delta kappa &lt; 0.45 and -0.29 &lt;lambda &lt; 0.30.</p>
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6.
  • Abazov, V. M., et al. (författare)
  • Measurement of beta (t -&gt; Wb)/beta(t -&gt; Wq) at root s=1.96 TeV
  • 2006
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 639:6, s. 616-622
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present the measurement of R = B(t -&gt; Wb)/B(t -&gt; Wq) in pp collisions at root s = 1.96 TeV, using 230 pb(-1) of data collected by the DO experiment at the Fermilab Tevatron Collider. We fit simultaneously R and the number (N-tt) of selected top quark pairs (tt), to the number of identified b-quark jets in events with one electron or one muon, three or more jets, and high transverse energy imbalance. To improve sensitivity, kinematical properties of events with no identified b-quark jets are included in the fit. We measure R = 1.03(-0.17)(0.19) (stat + syst), in good agreement with the standard model. We set lower limits of R &gt; 0.61 and vertical bar V-tb vertical bar &gt; 0.78 at 95% confidence level.</p>
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7.
  • Abazov, V. M., et al. (författare)
  • Measurement of the B-s(0) lifetime using semileptonic decays
  • 2006
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 97:24, s. 241801
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report a measurement of the B-s(0) lifetime in the semileptonic decay channel B-s(0)-&gt; D-s(-)mu(+)nu X (and its charge conjugate), using approximately 0.4 fb(-1) of data collected with the D0 detector during 2002-2004. Using 5176 reconstructed D-s(-)mu(+) signal events, we have measured the B-s(0) lifetime to be tau(B-s(0))=1.398 +/- 0.044(stat)(-0.025)(+0.028)(syst) ps. This is the most precise measurement of the B-s(0) lifetime to date.</p>
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8.
  • Abazov, V. M., et al. (författare)
  • Measurement of the isolated photon cross section in p(p)over-bar collisions at root s=1.96 TeV
  • 2006
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 639:3-4, s. 151-158
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The cross section for the inclusive production of isolated photons has been measured in p (p) over bar collisions at root s = 1.96 TeV with the DO detector at the Fermilab Tevatron Collider. The photons span transverse momenta 23 to 300 GeV and have pseudorapidity vertical bar n vertical bar &lt; 0.9. The cross section is compared with the results from two next-to-leading order perturbative QCD calculations. The theoretical predictions agree with the measurement within uncertainties.</p>
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9.
  • Abazov, V. M., et al. (författare)
  • Measurement of the p(p)over-bar -&gt; t(t)over-bar + X production cross section at root s=1.96 TeV in the fully hadronic decay channel
  • 2007
  • Ingår i: Physical Review D - Particles, Fields, Gravitation and Cosmology. - 1550-7998. ; 76:7, s. 072007
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A measurement of the top quark pair production cross section in proton antiproton collisions at an interaction energy of root s=1.96 TeV is presented. This analysis uses 405 +/- 25 pb(-1) of data collected with the D0 detector at the Fermilab Tevatron Collider. Fully hadronic t (t) over bar decays with final states of six or more jets are separated from the multijet background using secondary vertex tagging and a neural network. The t (t) over bar cross section is measured as sigma(t (t) over bar)=4.5(-1.9)(+2.0)(stat)(-1.1)(+1.4)(syst)+/- 0.3(lumi) pb for a top quark mass of m(t)=175 GeV/c(2).</p>
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10.
  • Abazov, V. M., et al. (författare)
  • Measurement of the top quark mass in the lepton plus jets final state with the matrix element method
  • 2006
  • Ingår i: Physical Review D - Particles, Fields, Gravitation and Cosmology. - 1550-7998. ; 74:9, s. 092005
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the top quark mass with the matrix element method in the lepton+jets final state. As the energy scale for calorimeter jets represents the dominant source of systematic uncertainty, the matrix element likelihood is extended by an additional parameter, which is defined as a global multiplicative factor applied to the standard energy scale. The top quark mass is obtained from a fit that yields the combined statistical and systematic jet energy scale uncertainty. Using a data set of 0.4 fb(-1) taken with the D0 experiment at Run II of the Fermilab Tevatron Collider, the mass of the top quark is measured using topological information to be: m(top)(center dot+jets)(topo)=169.2(-7.4)(+5.0)(stat+JES)(-1.4)(+1.5)(syst) GeV, and when information about identified b jets is included: m(top)(center dot+jets)(b-tag)=170.3(-4.5)(+4.1)(stat+ JES)(-1.8)(+1.2)(syst) GeV. The measurements yield a jet energy scale consistent with the reference scale.</p>
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