Measurement of the production of a W boson in association with a charm quark in pp collisions at √s = 7TeV with the ATLAS detector

The ATLAS collaboration

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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 = 7TeV 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 0.30 at Q2 = 1.9 GeV, 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.

元の言語英語
記事番号68
ページ(範囲)1-67
ページ数67
ジャーナルJournal of High Energy Physics
2014
発行部数5
DOI
出版物ステータス出版済み - 1 1 2014

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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