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1.
  • 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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2.
  • Abazov, V. M., et al. (författare)
  • Measurements of single top quark production cross sections and vertical bar V(tb)vertical bar in p(p)over-bar collisions at root s=1.96 TeV
  • 2011
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 84:11, s. 112001
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present measurements of production cross sections of single top quarks in p (p) over bar collisions at root s = 1.96 TeV in a data sample corresponding to an integrated luminosity of 5.4 fb(-1) collected by the D0 detector at the Fermilab Tevatron Collider. We select events with an isolated electron or muon, an imbalance in transverse energy, and two, three, or four jets, with one or two of them containing a bottom hadron. We obtain an inclusive cross section of sigma(p (p) over bar -&gt; tb + X, tqb + X) = 3.43(-0.74)(+0.73) pb and use it to extract the CKM matrix element 0.79 &lt; vertical bar V(tb)vertical bar &lt;= 1 at the 95% C.L. We also measure sigma(p&lt;(p)over bar&gt; -&gt; tb + X) = 0.68(-0.35)(+0.38) pb and sigma(p (p) over bar -&gt; tqb + X) = 2.86(-0.63)(+0.69) pb when assuming, respectively, tqb and tb production rates as predicted by the standard model.</p>
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3.
  • Abazov, V. M., et al. (författare)
  • Z(gamma) production and limits on anomalous ZZ(gamma) and Z(gamma gamma) couplings in p(p)over-bar collisions at root s 1.96 TeV
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 85:5, s. 052001
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of p (p) over bar -&gt; Z gamma -&gt; l(+)l(-)gamma (l = e, mu) production with a data sample corresponding to an integrated luminosity of 6.2 fb(-1) collected by the D0 detector at the Fermilab Tevatron p (p) over bar Collider. The results of the electron and muon channels are combined, and we measure the total production cross section and the differential cross section d(sigma)/dp(T)(gamma), where p(T)(gamma) is the momentum of the photon in the plane transverse to the beam line. The results obtained are consistent with the standard model predictions from next-to-leading order calculations. We use the transverse momentum spectrum of the photon to place limits on anomalous ZZ gamma and Z gamma gamma couplings.</p>
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4.
  • Aaltonen, T., et al. (författare)
  • Tevatron Run II combination of the effective leptonic electroweak mixing angle
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 97:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Drell-Yan lepton pairs produced in the process p (p) over bar -&gt; l(+)l(-) + X through an intermediate gamma*/Z boson have an asymmetry in their angular distribution related to the spontaneous symmetry breaking of the electroweak force and the associated mixing of its neutral gauge bosons. The CDF and D0 experiments have measured the effective-leptonic electroweak mixing parameter sin(2) theta(lept)(eff) using electron and muon pairs selected from the full Tevatron proton-antiproton data sets collected in 2001-2011, corresponding to 9-10 fb(-1) of integrated luminosity. The combination of these measurements yields the most precise result from hadron colliders, sin(2)theta(lept)(eff) = 0.23148 +/- 0.00033. This result is consistent with, and approaches in precision, the best measurements from electron-positron colliders. The standard model inference of the on-shell electroweak mixing parameter sin(2) theta(W), or equivalently the W-boson mass M-W, using the ZFITTER software package yields sin(2) theta(W) = 0.22324 +/- 0.00033 or equivalently, M-W = 80.367 +/- 0.017 GeV/c(2).</p>
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5.
  • Abazov, V. M., et al. (författare)
  • Combined D0 measurements constraining the CP-violating phase and width difference in the B-s(0) system
  • 2007
  • Ingår i: Physical Review D - Particles, Fields, Gravitation and Cosmology. - 1550-7998. ; 76:5, s. 057101
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We combine the D0 measurement of the width difference between the light and heavy B-s(0) mass eigenstates and of the CP-violating mixing phase determined from the time-dependent angular distributions in the B-s(0)-&gt; J/psi phi decays along with the charge asymmetry in semileptonic decays also measured with the D0 detector. With the additional constraint from the world average of the flavor-specific B-s(0) lifetime, we obtain Delta Gamma(s)equivalent to(Gamma(L)-Gamma(H))=0.13 +/- 0.09 ps(-1) and vertical bar phi(s)vertical bar=0.70(-0.47)(+0.39) or Delta Gamma(s)=-0.13 +/- 0.09 ps(-1) and vertical bar phi(s)vertical bar=2.44(-0.39)(+0.47). The data sample corresponds to an integrated luminosity of 1.1 fb(-1) accumulated with the D0 detector at the Fermilab Tevatron Collider.</p>
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6.
  • Abazov, V. M., et al. (författare)
  • Evidence for Spin Correlation in t(t)over-bar Production
  • 2012
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 108:3, s. 032004
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of the ratio of events with correlated t and (t) over bar spins to the total number of t (t) over bar events. This ratio f is evaluated using a matrix-element-based approach in 729 t (t) over bar candidate events with a single lepton l (electron or muon) and at least four jets. The analyzed p (p) over bar collisions data correspond to an integrated luminosity of 5: 3 fb(-1) and were collected with the D0 detector at the Fermilab Tevatron collider operating at a center-of-mass energy root s = 1.96 TeV. Combining this result with a recent measurement of f in dileptonic final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in t (t) over bar events with a significance of more than 3 standard deviations.</p>
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7.
  • 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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8.
  • Abazov, V. M., et al. (författare)
  • Lifetime difference and CP-violating phase in the B-s(0) system
  • 2007
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 98:12, s. 121801
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>From an analysis of the decay B-s(0)-&gt; J/psi phi, we obtain the width difference between the light and heavy mass eigenstates Delta Gamma equivalent to(Gamma(L)-Gamma(H))=0.17 +/- 0.09(stat)+/- 0.02(syst) ps(-1) and the CP-violating phase phi(s)=-0.79 +/- 0.56(stat)(-0.01)(+0.14)(syst). Under the hypothesis of no CP violation (phi(s)equivalent to 0), we obtain 1/Gamma=tau/(B-s(0))=1.52 +/- 0.08(stat)(-0.03)(+0.01)(syst) ps and Delta Gamma=0.12(-0.10)(+0.08)(stat)+/- 0.02(syst) ps(-1). The data sample corresponds to an integrated luminosity of about 1.1 fb(-1) accumulated with the D0 detector at the Fermilab Tevatron collider. This is the first direct measurement of the CP-violating mixing phase in the B-s(0) system.</p>
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9.
  • 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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10.
  • Abazov, V. M., et al. (författare)
  • Measurement of the CP-violating phase phi sJ/psi phi using the flavor-tagged decay Bs(0) -&gt; J/psi phi in 8 fb(-1) of p(p)over-bar collisions
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 85:3, s. 032006
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report an updated measurement of the CP-violating phase, phi(J/psi phi)(s), and the decay-width difference for the two mass eigenstates, Delta Gamma(s), from the flavor-tagged decay B-s(0) -&gt; J/psi phi. The data sample corresponds to an integrated luminosity of 8.0 fb(-1) accumulated with the D0 detector using p (p) over bar collisions at root s = 1.96 TeV produced at the Fermilab Tevatron collider. The 68% Bayesian credibility intervals, including systematic uncertainties, are Delta Gamma(s) = 0.163(-0.064)(+0.065) ps(-1) and phi(J/psi phi)(s) = -0.55(-0.36)(+0.38). The p-value for the Standard Model point is 29.8%.</p>
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