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W and Z boson production in p-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV

  • Regular Article - Experimental Physics
  • Open Access
  • Published: 15 February 2017
  • volume 2017, Article number: 77 (2017)
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Journal of High Energy Physics Aims and scope Submit manuscript
W and Z boson production in p-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV
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A preprint version of the article is available at arXiv.

Abstract

The W and Z boson production was measured via the muonic decay channel in proton-lead collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV at the Large Hadron Collider with the ALICE detector. The measurement covers backward (−4.46 < y cms < −2.96) and forward (2.03 < y cms < 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 μμ < 120 GeV/c 2 and muon transverse momentum (p μT ) larger than 20 GeV/c, is measured. The production cross section and charge asymmetry of muons from W-boson decays with p μT > 10 GeV/c are determined. The results are compared to theoretical calculations both with and without including the nuclear modification 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.

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