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Title: | Measurement of the production of a W boson in association with a charm quark in pp collisions at √s = 7TeV with the ATLAS detector | Authors: | Santos, S. P. Amor dos Carvalho, J. Fiolhais, M. C. N. Galhardo, B. Veloso, F. Wolters, H. ATLAS Collaboration |
Keywords: | Electroweak interaction; Hadron-Hadron Scattering; Charm physics | Issue Date: | 2014 | Publisher: | Springer Nature | Serial title, monograph or event: | Journal of High Energy Physics | Volume: | 2014 | Issue: | 5 | 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 √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 0.30 at Q2 = 1.9 GeV, 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. | URI: | https://hdl.handle.net/10316/109477 | DOI: | 10.1007/JHEP05(2014)068 | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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Measurement-of-the-production-of-a-W-boson-in-association-with-a-charm-quark-in-pp-collisions-at-s--7TeV-with-the-ATLAS-detectorJournal-of-High-Energy-Physics.pdf | 1.84 MB | Adobe PDF | View/Open |
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