Edinburgh Research Explorer

Inclusive W and Z production in the forward region at s = 7 TeV

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)058
Number of pages1
JournalJournal of High Energy Physics
Early online date7 Apr 2011
StatePublished - Jun 2012


Measurements of inclusive W and Z boson production cross-sections in pp collisions at s√=7 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±29 pb} for W+, {656±8±19±23 pb} for W− and {76.7±1.7±3.3±2.7 pb} 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 σW+→μ+ν/σW−→μ−νˉ={1.27±0.02±0.01}, and σW+→μ+ν+σW−→μ−νˉ)/σZ→μμ={19.4±0.5±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.

ID: 3963648