Article
Measurement of the production of a W boson in association with a charm quark in pp collisions at = 7 TeV with the ATLAS detector
Journal of High Energy Physics, Springer Nature, ISSN 1126-6708
Volume 2014, 5, 2014
DOI:10.1007/jhep05(2014)068, Dimensions: pub.1015487046,
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Description
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 = 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 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+ +)/σ(W− + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the quark asymmetry.
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