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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
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2901
2014 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 5, 1-67 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Electroweak interaction, Hadron-Hadron Scattering, Charm physics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-147704DOI: 10.1007/JHEP05(2014)068ISI: 000336799600001OAI: oai:DiVA.org:kth-147704DiVA: diva2:731878
Note

QC 20140702

Available from: 2014-07-02 Created: 2014-07-02 Last updated: 2017-12-05Bibliographically approved

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Strandberg, Jonas

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