Observation of nuclear modifications in W± boson production in pPb collisions at sNN=8.16TeV

CMS Collaboration

Research output: Contribution to journalArticle

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 |ηlab μ|<2.4 and transverse momentum pT μ>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.

Original languageEnglish
Article number135048
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume800
DOIs
Publication statusPublished - 10 Jan 2020

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Keywords

  • CMS
  • Electroweak
  • Heavy ions
  • nPDF
  • pPb
  • W boson

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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