Inclusive W and Z production in the forward region at ?s = 7 \textTeV \sqrt {s} = 7\,{\text{TeV}}
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文摘
Measurements of inclusive W and Z boson production cross-sections in pp collisions at ?s = 7 \textTeV \sqrt {s} = 7\,{\text{TeV}} using final states containing muons are presented. The data sample corresponds to an integrated luminosity of 37 pb?1 collected with the LHCb detector. The W and Z bosons are reconstructed from muons with a transverse momentum above 20 GeV/c and pseudorapidity between 2.0 and 4.5, and, in the case of the Z cross-section, a dimuon invariant mass between 60 and 120 GeV/c2. The cross-sections are measured to be 831?±?9?±?27?±?29pb for W +, 656?±?8?±?19?±?23 for W ? and 76.7?±?1.7?±?3.3?±?2.7pb for Z, where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity. Differential cross-sections, W and Z cross-section ratios and the lepton charge asymmetry are also measured in the same kinematic region. The ratios are determined to be sW + ? m + n/sW - ? m - [`(n)] = 1.27±0.02±0.01 {\sigma_{{{W^{ + }} \to {\mu^{ + }}\nu }}}/{\sigma_{{{W^{ - }} \to {\mu^{ - }}\overline \nu }}} = 1.27\pm 0.02\pm 0.01 and ( sW + ? m + n + sW - ? m - [`(n)] )/sZ ? mm = 19.4±0.5±0.9 \left( {{\sigma_{{{W^{ + }} \to {\mu^{ + }}\nu }}} + {\sigma_{{{W^{ - }} \to {\mu^{ - }}\overline \nu }}}} \right)/{\sigma_{{Z \to \mu \mu }}} = 19.4\pm 0.5\pm 0.9 . The results are in general agreement with theoretical predictions, performed at next-to-next-to-leading order in QCD using recently calculated parton distribution functions.

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