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Observation of nuclear modifications in W± boson production in pPb collisions at sNN=8.16TeV

  • Author(s): Sirunyan, AM
  • Tumasyan, A
  • Adam, W
  • Ambrogi, F
  • Asilar, E
  • Bergauer, T
  • Brandstetter, J
  • Dragicevic, M
  • Erö, J
  • Escalante Del Valle, A
  • Flechl, M
  • Frühwirth, R
  • Ghete, VM
  • Hrubec, J
  • Jeitler, M
  • Krammer, N
  • Krätschmer, I
  • Liko, D
  • Madlener, T
  • Mikulec, I
  • Rad, N
  • Rohringer, H
  • Schieck, J
  • Schöfbeck, R
  • Spanring, M
  • Spitzbart, D
  • Taurok, A
  • Waltenberger, W
  • Wittmann, J
  • Wulz, CE
  • Zarucki, M
  • Chekhovsky, V
  • Mossolov, V
  • Suarez Gonzalez, J
  • De Wolf, EA
  • Di Croce, D
  • Janssen, X
  • Lauwers, J
  • Pieters, M
  • Van Haevermaet, H
  • Van Mechelen, P
  • Van Remortel, N
  • Abu Zeid, S
  • Blekman, F
  • D'Hondt, J
  • De Bruyn, I
  • De Clercq, J
  • Deroover, K
  • Flouris, G
  • Lontkovskyi, D
  • Lowette, S
  • Marchesini, I
  • Moortgat, S
  • Moreels, L
  • Python, Q
  • Skovpen, K
  • Tavernier, S
  • Van Doninck, W
  • Van Mulders, P
  • Van Parijs, I
  • Beghin, D
  • Bilin, B
  • Brun, H
  • Clerbaux, B
  • De Lentdecker, G
  • Delannoy, H
  • Dorney, B
  • Fasanella, G
  • Favart, L
  • Goldouzian, R
  • Grebenyuk, A
  • Kalsi, AK
  • Lenzi, T
  • Luetic, J
  • Postiau, N
  • Starling, E
  • Thomas, L
  • Vander Velde, C
  • Vanlaer, P
  • Vannerom, D
  • Wang, Q
  • Cornelis, T
  • Dobur, D
  • Fagot, A
  • Gul, M
  • Khvastunov, I
  • Poyraz, D
  • Roskas, C
  • Trocino, D
  • Tytgat, M
  • Verbeke, W
  • Vermassen, B
  • Vit, M
  • Zaganidis, N
  • Bakhshiansohi, H
  • Bondu, O
  • Brochet, S
  • Bruno, G
  • Caputo, C
  • David, P
  • et al.
Abstract

The production of W± bosons is studied in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of sNN=8.16TeV. Measurements are performed in the W±→μ±νμ channel using a data sample corresponding to an integrated luminosity of 173.4±6.1nb−1, collected by the CMS Collaboration at the LHC. The number of positively and negatively charged W bosons is determined separately in the muon pseudorapidity region in the laboratory frame |ηlabμ|<2.4 and transverse momentum pTμ>25GeV/c. The W± boson differential cross sections, muon charge asymmetry, and the ratios of W± boson yields for the proton-going over the Pb-going beam directions are reported as a function of the muon pseudorapidity in the nucleon-nucleon centre-of-mass frame. The measurements are compared to the predictions from theoretical calculations based on parton distribution functions (PDFs) at next-to-leading-order. The results favour PDF calculations that include nuclear modifications and provide constraints on the nuclear PDF global fits.

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