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

The ATLAS Collaboration

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    Abstract

    The production of a W boson in association with a single charm quark is studied using 4.6 fb<sup>−1</sup>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+0.26 −0.30 at Q<sup>2</sup>= 1.9 GeV<sup>2</sup>, 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

    Original languageEnglish
    Article number68
    JournalJournal of High Energy Physics
    Volume2014
    Issue number5
    DOIs
    Publication statusPublished - 2014 May 16

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    Keywords

    • Charm physics
    • Electroweak interaction
    • Hadron-Hadron Scattering

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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