Measurement of the production of a $W$ boson in association with a charm quark in $pp$ collisions at $\sqrt{s} =$ 7 TeV with the ATLAS detector
(2014) Journal of High Energy Physics — Vol. 05 (2014)
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- Abstract
- 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 sqrt(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 -0.30 at Q^2=1.9 GeV^2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio sigma(W^+ + bar{c})/sigma(W^- + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s-bar{s} quark asymmetry.
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Tanasijczuk, A. J., ATLAS, & et al. (2014). Measurement of the production of a $W$ boson in association with a charm quark in $pp$ collisions at $\sqrt{s} =$ 7 TeV with the ATLAS detector. Journal of High Energy Physics, 05. https://doi.org/10.1007/JHEP05(2014)068 (Original work published 2014)