Measurement of the pp →W +b + X production cross section at √ s = 1.96 TeV (English)

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We present a measurement of the cross section for W boson production in association with at least one b-quark jet in proton–antiproton collisions. The measurement is made using data corresponding to an integrated luminosity of 6.1 fb−1 recorded with the D0 detector at the Fermilab Tevatron p¯p √ Collider at s = 1.96 TeV. We measure an inclusive cross section of σ(W(→μν) + b + X) = 1.04 ± 0.05 (stat.) ± 0.12 (syst.) pb and σ(W(→eν)+b+ X) = 1.00±0.04 (stat.)±0.12 (syst.) pb in the phase space defined by pνT > 25 GeV, pb-jet T > 20 GeV, |ηb-jet| < 1.1, and a muon (electron) with p T > 20 GeV and |ημ| < 1.7 (|ηe | < 1.1 or 1.5 < |ηe | < 2.5). The combined result per lepton family is σ(W(→ ν) + b + X) = 1.05 ± 0.12 (stat. + syst.) pb for |η | < 1.7. The results are in agreement with predictions from next-toleading order QCD calculations using mcfm, σ(W +b) · B(W → ν) = 1.34+0.41 −0.34

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