Observation of Z production in proton-lead collisions at LHCb
Author(s)Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, M.
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of High Energy Physics
Springer-Verlag Berlin Heidelberg
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).
Final published version