Measurement of the ppbar -> W+b+X production cross section at \sqrt{s}=1.96 TeV

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.
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Physics Letters B, Elsevier, 2013, 718, pp.1314-1320. <10.1016/j.physletb.2012.12.044>


http://hal.in2p3.fr/in2p3-00737940
Contributor : Sylvie Florès <>
Submitted on : Wednesday, October 3, 2012 - 7:00:57 AM
Last modification on : Tuesday, January 15, 2013 - 2:00:08 PM

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V.M. Abazov, U. Bassler, G. Bernardi, M. Besançon, D. Brown, et al.. Measurement of the ppbar -> W+b+X production cross section at \sqrt{s}=1.96 TeV. Physics Letters B, Elsevier, 2013, 718, pp.1314-1320. <10.1016/j.physletb.2012.12.044>. <in2p3-00737940>

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