W and Z boson production in p-Pb collisions at √sNN = 5.02 TeV

Abstract

The W and Z boson production was measured via the muonic decay channel in proton-lead collisions at √sNN = 5:02 TeV at the Large Hadron Collider with the ALICE detector. The measurement covers backward (-4:46 < ycms < -2:96) and forward (2:03 < ycms < 3:53) rapidity regions, corresponding to Pb-going and p-going directions, respectively. The Z-boson production cross section, with dimuon invariant mass of 60 < m pp < 120 GeV/c2 and muon transverse momentum (pT) larger than 20 GeV/c, is measured. The production cross section and charge asymmetry of muons from W-boson decays with p_T > 10 GeV/c are determined. The results are compared to theoretical calculations both with and without including the nuclear modi_cation of the parton distribution functions. The W-boson production is also studied as a function of the collision centrality: the cross section of muons from W-boson decays is found to scale with the average number of binary nucleon-nucleon collisions within uncertainties.