Measurement of forward W and Z boson production in pp collisions at √s =8 TeV.

The LHCb Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Measurements are presented of electroweak boson production using data from pp collisions at a centre-of-mass energy of √s =8 TeV. The analysis is based on an integrated luminosity of 2.0 fb−1 recorded with the LHCb detector. The bosons are identified in the W → μν and Z → μ+μ decay channels. The cross-sections are measured for muons in the pseudorapidity range 2.0 < η < 4.5, with transverse momenta pT> 20 GeV/c and, in the case of the Z boson, a dimuon mass within 60<Mμ+μ−<120 GeV/c2. The results are

σW + →µ+ ν = 1093.6 ± 2.1 ± 7.2 ± 10.9 ± 12.7 pb ,

σW − →µ− ν = 818.4 ± 1.9 ± 5.0 ± 7.0 ± 9.5 pb ,

σZ →µ+ µ− = 95.0 ± 0.3 ± 0.7 ± 1.1 ± 1.1 pb ,


where the first uncertainties are statistical, the second are systematic, the third are due to the knowledge of the LHC beam energy and the fourth are due to the luminosity determination. The evolution of the W and Z boson cross-sections with centre-of-mass energy is studied using previously reported measurements with 1.0 fb−1 of data at 7 TeV. Differential distributions are also presented. Results are in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics.

Original languageEnglish
Article number155
Pages (from-to)1-45
Number of pages45
JournalJournal of High Energy Physics
Volume2016
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Electroweak interaction
  • Forward physics
  • Hadron-Hadron scattering

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