In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2012, No. 6 ( 2012-06)
Abstract:
Measurements of inclusive W and Z boson production cross-sections in pp collisions at $ \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/c 2 . 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 $ {\sigma_{{{W^{ + }} \to {\mu^{ + }}\nu }}}/{\sigma_{{{W^{ - }} \to {\mu^{ - }}\overline \nu }}} = 1.27\pm 0.02\pm 0.01 $ and $ \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.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP06(2012)058
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2012
detail.hit.zdb_id:
2027350-2
