/ Experiment-HEP arXiv:1210.0627

Measurement of the $p\bar{p} \to W+b+X$ production cross section at $\sqrt{s}=1.96$ TeV

Pages: 8

Abstract: 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\ifb recorded with the D0 detector at the Fermilab Tevatron \ppbar Collider at $\sqrt{s}=1.96$ TeV. We measure an inclusive cross section of {$\sigma(W \sim(\to\mu\nu) + b + X) = 1.04 \pm 0.05\thinspace$(stat.) $\pm 0.12 \thinspace$(syst.) pb} and $\sigma(W (\to e\nu) + b + X) = 1.00$ \pm 0.04 \thinspace$(stat.)$\pm 0.12 \thinspace$(syst.) pb in the phase space defined by$p_T^\nu > 25$GeV,$p_T^{\text{$b$-jet}}>20$GeV,$|\eta^{\text{$b$-jet}}|<1.1$, and a muon (electron) with$p_T^\ell>20$GeV and$|\eta^\mu|<1.7$($|\eta^e|<1.1$or$1.5<|\eta^e|<2.5$). The combined result per lepton family is$\sigma(W (\to \ell \nu) + b + X) = 1.05\pm 0.12 \thinspace$(stat.+syst.) for$|\eta^\ell|<1.7$. The results are in agreement with predictions from next-to-leading order QCD calculations using \textsc{mcfm},$\sigma(W+b)\cdot {\cal B}(W \to \ell \nu)= 1.34 ^{+0.41}_{-0.34}\thinspace(\textrm{syst.})\$, and also with predictions from the \textsc{sherpa} and \textsc{madgraph} Monte Carlo event generators.

Note: 8 pages, 4 figures

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