Observation of Z production in proton-lead collisions at LHCb

The LHCb Collaboration

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The first observation of Z boson production in proton-lead collisions at a
centre-of-mass energy per proton-nucleon pair of √sNN = 5 TeV is presented. The data sample corresponds to an integrated luminosity of 1.6 nb−1 collected with the LHCb detector. The Z candidates are reconstructed from pairs of oppositely charged muons with pseudorapidities between 2.0 and 4.5 and transverse momenta above 20 GeV/c. The invariant dimuon mass is restricted to the range 60−120 GeV/c. The Z production cross-section is measured to be
σZ→µ+µ− (fwd) = 13.5+5.4−4.0(stat.) ± 1.2(syst.) nb
in the direction of the proton beam and
σZ→µ+µ− (bwd) = 10.7+8.4−5.1(stat.) ± 1.0(syst.) nb
in the direction of the lead beam, where the first uncertainty is statistical and the second systematic.
Original languageEnglish
Article number030
Number of pages18
JournalJournal of High Energy Physics
Issue number9
Publication statusPublished - 2014
Externally publishedYes


  • Electroweak interaction
  • Heavy Ions
  • Heavy-ion collision
  • Particle and resonance production
  • Forward physics

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