Study of W boson production in pPb collisions at root(NN)-N-S=5.02 TeV

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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 nb(^{-1}) at a nucleonânucleon 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/(c), and as a function of the lepton pseudorapidity in the |(\eta_{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.

CMS, W boson, pPb collisions, PARTON, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Physics
Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., Kiesenhofer, W., Knünz, V., Krammer, M., Krätschmer, I., Liko, D., … Woods, N. (2015). Study of W boson production in pPb collisions at sNN=5.02 TeV. In Physics Letters B (Vol. 750, pp. 565–586). Elsevier BV.