Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/102675
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Type: Journal article
Title: Measurement of the production of a W boson in association with a charm quark in pp collisions at √s = 7 TeV with the ATLAS detector
Other Titles: Measurement of the production of a W boson in association with a charm quark in pp collisions at root s = 7 TeV with the ATLAS detector
Author: Aad, G.
ATLAS Collaboration
Citation: The Journal of High Energy Physics, 2014; 2014(5):1-65
Publisher: Springer
Issue Date: 2014
ISSN: 1029-8479
1126-6708
Statement of
Responsibility: 
G. Aad … P. Jackson … L. Lee … A. Petridis … N. Soni ... M. White ... et al. (The ATLAS Collaboration)
Abstract: The production of a W boson in association with a single charm quark is studied using 4.6 fb−1 of pp collision data at s√ = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea-quark distributions is determined to be 0.96+0.26−0.30 at Q2 = 1.9 GeV2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio σ(W+ +c¯)/σ(W− + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s−s¯ quark asymmetry.
Keywords: Electroweak interaction, Hadron-Hadron scattering, charm physics
Rights: © The Author(s) 2014. Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
DOI: 10.1007/JHEP05(2014)068
Published version: http://dx.doi.org/10.1007/JHEP05(2014)068
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