Measurement of the forward W boson cross-section in pp collisions at √s = 7 TeV
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Author(s)
Counts, Ian Thomas Hunt
Ilten, Philip J
Williams, Michael
Date Issued
December 2014
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Measurement of the Forward W Boson Cross-Section in Pp Collisions at √s = 7 TeV.” J. High Energ. Phys. 2014, no. 12 (December 2014).
Version
Final published version
Abstract
A measurement of the inclusive W → μν production cross-section using data from pp collisions at a centre-of-mass energy of √s=7 TeV is presented. The analysis is based on an integrated luminosity of about 1.0 fb[superscript −1] recorded with the LHCb detector. Results are reported for muons with a transverse momentum greater than 20 [GeV over c] and pseudorapidity between 2.0 and 4.5. The W [superscript +] and W [superscript −] production cross-sections are measured to be
σW[superscript +]→μ[superscript +]ν=861.0±2.0±11.2±14.7pb,
σW[superscript −]→μ[superscript −] [bar over ν] = 675.8±1.9±8.8±11.6pb,
where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity determination. Cross-section ratios and differential distributions as functions of the muon pseudorapidity are also presented. The ratio of W [superscript +] to W [superscript −] cross-sections in the same fiducial kinematic region is determined to be
σW [superscript +] → μ [superscript +] ν [over σW [superscript −] → μ [superscript −] [bar over ν]] = 1.274±0.005±0.009,
where the uncertainties are statistical and systematic, respectively. Results are in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP12(2014)079
