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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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Journal of High Energy Physics
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
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