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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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