Sirunyan, AM;
Tumasyan, A;
Adam, W;
Ambrogi, F;
Asilar, E;
Bergauer, T;
Brandstetter, J;
... David, P; + view all
(2020)
Observation of nuclear modifications in W^{±} boson production in pPb collisions at \sqrt{sNN} = 8.16 TeV.
Physics Letters B
, 800
, Article 135048. 10.1016/j.physletb.2019.135048.
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Abstract
The production of W^{±} bosons is studied in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of \sqrt{sNN} = 8.16 TeV. Measurements are performed in theW^{±} → 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} > 25 GeV/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.
| Type: | Article |
|---|---|
| Title: | Observation of nuclear modifications in W^{±} boson production in pPb collisions at \sqrt{sNN} = 8.16 TeV |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.physletb.2019.135048 |
| Publisher version: | https://doi.org/10.1016/j.physletb.2019.135048 |
| Language: | English |
| Additional information: | © 2019 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | CMS, Heavy ions, Electroweak, W boson, pPb, nPDF |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10089620 |
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