Measurement of forward Z → e+e production at √s = 8 TeV

The LHCb Collaboration

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A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8 TeV centre-of-mass energy is presented. The measurement is based on a sample of Z → e+e− decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0 fb−1. The acceptance is defined by the requirements 2.0 < η < 4.5 and pT > 20 GeV for the pseudorapidities and transverse momenta of the leptons. Their invariant mass is required to lie in the range 60-120 GeV. The cross-section is determined to beσ(pp → Z → e +e −) = 93.81 ± 0.41(stat) ± 1.48(syst) ± 1.14(lumi) pb ,where the first uncertainty is statistical and the second reflects all systematic effects apart from that arising from the luminosity, which is given as the third uncertainty. Differential cross-sections are presented as functions of the Z-boson rapidity and of the angular variable ϕ∗, which is related to the Z-boson transverse momentum.
Original languageEnglish
Article number109
Pages (from-to)1-21
Number of pages21
JournalJournal of High Energy Physics
Issue number5
Publication statusPublished - 2015
Externally publishedYes


  • Electroweak interaction
  • QCD
  • Forward physics
  • Hadron-Hadron Scattering
  • proton-proton scattering

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