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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

Author(s)
Taylor, Frank E.
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Abstract
The production of a W boson in association with a single charm quark is studied using 4.6 fb[superscript −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 over −0.30] at Q [superscript 2] = 1.9 GeV[superscript 2], which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio σ(W [superscript +] + [bar over c])/σ(W [superscript −] + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s − [bar over s] quark asymmetry.
Date issued
2014-05
URI
http://hdl.handle.net/1721.1/89410
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, et al. “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.” J. High Energ. Phys. 2014, no. 5 (May 2014). © CERN, for the benefit of the ATLAS Collaboration
Version: Final published version
ISSN
1029-8479
1126-6708

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