Measurement of forward W → eν production in pp collisions at √s=8 TeV

The Lhcb Collaboration

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17 Scopus citations

Abstract

A measurement of the cross-section for W → eν production in pp collisions is presented using data corresponding to an integrated luminosity of 2 fb−1 collected by the LHCb experiment at a centre-of-mass energy of √s=8 TeV. The electrons are required to have more than 20 GeV of transverse momentum and to lie between 2.00 and 4.25 in pseudorapidity. The inclusive W production cross-sections, where the W decays to eν, are measured to be (Formula presented.) 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. Differential cross-sections as a function of the electron pseudorapidity are measured. The W+/W cross-section ratio and production charge asymmetry are also reported. Results are compared with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics. Finally, in a precise test of lepton universality, the ratio of W boson branching fractions is determined to be B(W → eν)=B(W → µν) = 1:020 ± 0:002 ± 0:019 where the first uncertainty is statistical and the second is systematic.[Figure not available: see fulltext.]

Original languageEnglish (US)
Article number30
JournalJournal of High Energy Physics
Volume2016
Issue number10
DOIs
StatePublished - Oct 1 2016

Keywords

  • Electroweak interaction
  • Hadron-Hadron scattering (experiments)
  • QCD

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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