Observation of nuclear modifications in W±boson production in pPb collisions at √sNN=8.16 TeV
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Type :
Article
Publication Status :
Published
Access :
openAccess
Abstract
The production of W-+/- bosons is studied in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of root s(NN) = 8.16 TeV. Measurements are performed in the W-+/- -> mu(+/-)nu(mu) channel using a data sample corresponding to an integrated luminosity of 173.4 +/- 6.1 nb(-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 vertical bar eta(mu)(lab)vertical bar < 2.4 and transverse momentum p(T)(mu) > 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.
Source :
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Date :
2020-01-10
Volume :
800
Publisher :
Elsevier
URI
http://hdl.handle.net/10679/7261https://www.sciencedirect.com/science/article/pii/S0370269319307701
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