We report an improved measurement of the valence <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>u</a:mi></a:math> and <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>d</c:mi></c:math> quark distributions from the forward-backward asymmetry in the Drell-Yan process using <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mn>8.6</e:mn><e:mtext> </e:mtext><e:mtext> </e:mtext><e:msup><e:mi>fb</e:mi><e:mrow><e:mo>−</e:mo><e:mn>1</e:mn></e:mr…

We present various properties of the production of the $X(3872)$ and $ψ(2S)$ states based on $10.4 fb^{−1}$ collected by the D0 experiment in Tevatron $p\bar{p}$ collisions at $\sqrt{s}=1.96 TeV$. For both states, we measure the nonprompt fraction $f_{NP}$ of the inclusive production rate due to decays of $b$-flavored hadrons. We find the $f_{NP}$ values systematically below those obtained at the LHC. The fNP fraction for $ψ(2S)$ increases with transverse momentum, whereas for the $X(3872)$ it is constant within l…

Drell-Yan lepton pairs produced in the process $p\bar{p} → ℓ^+ ℓ^−$ + X through an intermediate γ∗/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 $sin^2 θ^{lept}_{eff}$ using electron and muon pairs selected from the full Tevatron proton-antiproton data sets collected in 2001-2011, correspon…

The CDF and D0 experiments at the Fermilab Tevatron have measured the asymmetry between yields of forward- and backward-produced top and antitop quarks based on their rapidity difference and the asymmetry between their decay leptons. These measurements use the full data sets collected in proton-antiproton collisions at a center-of-mass energy of $\sqrt s =1.96$ TeV. We report the results of combinations of the inclusive asymmetries and their differential dependencies on relevant kinematic quantities. The combined …

We present a combination of measurements of the top quark mass by the D0 experiment in the lepton+jets and dilepton channels. We use all the data collected in Run I (1992–1996) at √s=1.8 TeV and Run II (2001–2011) at √s = 1.96 TeV of the Tevatron $p\bar{p}$ collider, corresponding to integrated luminosities of 0.1 fb$^{−1}$ and 9.7 fb$^{−1}$, respectively. The combined result is: $m_t$ = 174.95±0.40(stat)±0.64(syst) GeV = 174.95±0.75 GeV.