- 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.