Observation of nuclear modifications in W&lt;sup&gt;±&lt;/sup&gt; boson production in pPb collisions at √&lt;em&gt;s&lt;/em&gt;&lt;sub&gt;NN&lt;/sub&gt; = 8.16TeV

Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Caminada, L.; Deiters, K.; Erdmann, W.; Horisberger, R.; Ingram, Q.; Kaestli, H.C.; Kotlinski, D.; Langenegger, U.; Rohe, T.; Wiederkehr, S.A.; Woods, N.

doi:10.1016/j.physletb.2019.135048

Observation of nuclear modifications in W^± boson production in pPb collisions at √s_NN = 8.16TeV

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Erö J, Escalante Del Valle A, Caminada L, Deiters K, Erdmann W, Horisberger R, Ingram Q, Kaestli HC, Kotlinski D, Langenegger U, Rohe T, Wiederkehr SA, Woods N, et al.

Citation

Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., … Woods, N. (2020). Observation of nuclear modifications in W^± boson production in pPb collisions at √s_NN = 8.16TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 800, 135048 (24 pp.). https://doi.org/10.1016/j.physletb.2019.135048

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:28661

The production of W^± bosons is studied in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of √s_NN = 8.16TeV. Measurements are performed in the W^± → μ^±ν_μ 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 |η^μ_lab| < 2.4 and transverse momentum p^μ_T > 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.