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Measurement of the Muon Charge Asymmetry in Inclusive pp → W + X Production at √s = 7 TeV and an Improved Determination of Light Parton Distribution Functions

Author(s)
Apyan, Aram; Busza, Wit; Cali, Ivan Amos; Chan, M.; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yoon, A. S.; Zanetti, Marco; Roland, Christof E; Roland, Gunther M; Stoeckli, Fabian; Sumorok, Konstanty C; Yang, Mingming; Wyslouch, Victoria; Barbieri, Richard Alexander; Bauer, Gerry P; Dutta, Valentina; Lee, Yen-Jie; Levin, Andrew Michael; Luckey Jr, P David; ... Show more Show less
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Abstract
Measurements of the muon charge asymmetry in inclusive pp → W + X production at √s = 7  TeV are presented. The data sample corresponds to an integrated luminosity of 4.7  fb[superscript −1] recorded with the CMS detector at the LHC. With a sample of more than 20 million W → μν 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[superscript −3] to 10[superscript −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[superscript ±]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.
Date issued
2014-08
URI
http://hdl.handle.net/1721.1/91211
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Journal
Physical Review D
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurement of the Muon Charge Asymmetry in Inclusive pp → W + X Production at √s = 7 TeV and an Improved Determination of Light Parton Distribution Functions.” Phys. Rev. D 90, no. 3 (August 2014). © 2014 CERN, for the CMS Collaboration
Version: Final published version
ISSN
1550-7998
1550-2368

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