Measurement of the production of a W boson in association with a charm quark in pp collisions at root s=7 TeV with the ATLAS detector
Number of Authors: 2901
2014 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, Vol. 5, 1-67 p.Article in journal (Refereed) Published
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 root 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(-0.30)(+0.26) at Q (2) = 1.9 GeV2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio sigma(W (+) +)/sigma(W (-) + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s-(s) over bar quark asymmetry.
Place, publisher, year, edition, pages
2014. Vol. 5, 1-67 p.
Electroweak interaction, Hadron-Hadron Scattering, Charm physics
IdentifiersURN: urn:nbn:se:kth:diva-147704DOI: 10.1007/JHEP05(2014)068ISI: 000336799600001OAI: oai:DiVA.org:kth-147704DiVA: diva2:731878
QC 201407022014-07-022014-07-022014-07-04Bibliographically approved