Observation of nuclear modifications in W-+/- boson production in pPb collisions at root s(NN)=8.16 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2020) Observation of nuclear modifications in W-+/- boson production in pPb collisions at root s(NN)=8.16 TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 800. pp. 1-24. ISSN 0370-2693

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Abstract

The production of W± bosons is studied in proton-lead (pPb) collisions at a nucleon-nucleon centreof-mass energy of √sNN = 8.16 TeV. Measurements are performed in the W± → μ±νμ 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 |ημ lab| < 2.4 and transverse momentum pμ 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.

Item Type:	Article (Journal)
Additional Information:	7861/88866
Uncontrolled Keywords:	CMS, Heavy ions, Electroweak, W boson pPb nPDF
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Physics Kulliyyah of Science
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	12 Mar 2021 16:36
Last Modified:	12 Mar 2021 16:36
URI:	http://irep.iium.edu.my/id/eprint/88866

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