Study of W boson production in pPb collisions at sqrt(s[NN]) = 5.02 TeV

The CMS collaboration
Phys.Lett.B 750 (2015) 565-586, 2015.

Abstract (data abstract)
CERN-LHC. The first study of W boson production in pPb collisions is presented, for bosons decaying to a muon or electron, and a neutrino. The measurements are based on a data sample corresponding to an integrated luminosity of 34.6 inverse nanobarns at a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV, collected by the CMS experiment. The W boson differential cross sections, lepton charge asymmetry, and forward-backward asymmetries are measured for leptons of transverse momentum exceeding 25 GeV, and as a function of the lepton pseudorapidity in the $|\eta_{\textrm{lab}}| < 2.4$ range. Deviations from the expectations based on currently available parton distribution functions are observed, showing the need for including W boson data in nuclear parton distribution global fits.

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