3 research outputs found

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

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    The production of W\ub1 bosons is studied in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of 1asNN=8.16TeV. Measurements are performed in the W\ub1\u2192\u3bc\ub1\u3bd\u3bc channel using a data sample corresponding to an integrated luminosity of 173.4\ub16.1nb 121, 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 |\u3b7lab\u3bc|<2.4 and transverse momentum pT\u3bc>25GeV/c. The W\ub1 boson differential cross sections, muon charge asymmetry, and the ratios of W\ub1 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
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