- Main
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.
Published Web Location
https://doi.org/10.1016/j.physletb.2019.135048Abstract
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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