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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

CollaborationWith : Alexandre, Gauthier / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Martin Dit Latour, Bertrand / Mermod, Philippe / Miucci, Antonio / Mora Herrera, Maria Clemencia Rosario / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Pásztor, G. / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Vallecorsa, Sofia / Wu, Xin
Published in The journal of high energy physics. 2014, vol. 1405, p. 068-135
Collection Open Access - SCOAP3
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 = 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 GeV 2 , which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio σ ( W + + $ \overline{c} $ )/ σ ( W − + c ) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the $ s-\overline{s} $ quark asymmetry.
Keywords Electroweak interactionHadron-Hadron ScatteringCharm physics
arXiv: 1402.6263
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ATLAS COLLABORATION. 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. In: The journal of high energy physics, 2014, vol. 1405, p. 068-135. doi: 10.1007/JHEP05(2014)068 https://archive-ouverte.unige.ch/unige:55801

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Deposited on : 2015-04-27

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