@article{3162627, title = "Measurement of the muon charge asymmetry in inclusive pp -> W plus X production at root s=7 TeV and an improved determination of light parton distribution functions", author = "Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and and Adam, W. and Bergauer, T. and Dragicevic, M. and Eroe, J. and and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. M. and Hartl, and C. and Hoermann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and and Knuenz, V. and Krammer, M. and Kraetschmer, I. and Liko, D. and and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, H. and and Schoefbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, and W. and Waltenberger, W. and Wulz, C. -E. and Mossolov, V. and Shumeiko, and N. and Gonzalez, J. Suarez and Alderweireldt, S. and Bansal, M. and and Bansal, S. and Cornelis, T. and De Wolf, E. 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A. and Borrello, L. and Carlsmith, D. and and Cepeda, M. and Dasu, S. and Duric, S. and Friis, E. and Grothe, M. and and Hall-Wilton, R. and Herndon, M. and Herve, A. and Klabbers, P. and and Klukas, J. and Lanaro, A. and Levine, A. and Loveless, R. and Mohapatra, and A. and Ojalvo, I. and Perry, T. and Pierro, G. A. and Polese, G. and and Ross, I. and Sakharov, A. and Sarangi, T. and Savin, A. and Smith, W. H. and and CMS Collaboration", journal = "Physical Review D", year = "2014", volume = "90", number = "3", publisher = "AMER PHYSICAL SOC", issn = "2470-0010, 2470-0029", doi = "10.1103/PhysRevD.90.032004", abstract = "Measurements of the muon charge asymmetry in inclusive pp -> W + X production at root s = 7 TeV are presented. The data sample corresponds to an integrated luminosity of 4.7 fb(-1) recorded with the CMS detector at the LHC. With a sample of more than 20 million W -> mu nu events, the statistical precision is greatly improved in comparison to previous measurements. These new results provide additional constraints on the parton distribution functions of the proton in the range of the Bjorken scaling variable x from 10(-3) to 10(-1). These measurements and the recent CMS measurement of associated W + charm production are used together with the cross sections for inclusive deep inelastic e(+/-) p scattering at HERA in a next-to-leading-order QCD analysis. The determination of the valence quark distributions is improved, and the strange-quark distribution is probed directly through the leading-order process g + s -> W + c in proton-proton collisions at the LHC." }