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
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Chatrchyan-2014-Measurement of the muon.pdf
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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
Date Issued
August 2014
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
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Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.90.032004
