Observation of Z production in proton-lead collisions at LHCb
Author(s)
Counts, Ian Thomas Hunt; Ilten, Philip J; Williams, Michael
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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[superscript −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.
Date issued
2014-09Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Journal of High Energy Physics
Publisher
Springer-Verlag Berlin Heidelberg
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Observation of Z Production in Proton-Lead Collisions at LHCb.” J. High Energ. Phys. 2014, no. 9 (September 2014).
Version: Final published version
ISSN
1029-8479