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

• Published in: The journal of high energy physics 2014, Vol.2014 (5), p.1
• Main Authors: Agatonovic-jovin, T, Amidei, D, Amoroso, S, Antonelli, M, Assamagan, K, Barbero, M, Bell, W H, Bellagamba, L, Bieniek, S P, Biglietti, M, Bilbao De Mendizabal, J, Bindi, M, Bobbink, G J, Borissov, G, Boscherini, D, Bruni, A, Bussey, P, Chilingarov, A, Chiodini, G, Christidi, I A, Cindro, V, Clark, P J, Clemens, J C, Coccaro, A, D'onofrio, M, Dafinca, A, Dervan, P, Durglishvili, A, Erdmann, J, Etzion, E, Fassnacht, P, Fenyuk, A B, Ferrando, J, Gagliardi, G, Garberson, F, Goeringer, C, Goossens, L, Gornicki, E, Graziani, E, Hanawa, K, Hengler, C, Henrichs, A, Hrivnac, J, Ikeno, M, Ippolito, V, Izzo, V, Jennens, D, Ji, W, Klingenberg, R, Kluth, S, Kondo, T, Kordas, K, Kotwal, A, Kreutzfeldt, K, Kuhl, A, Laurelli, P, Lefebvre, M, Limosani, A, Lissauer, D, Loch, P, Loevschall-jensen, A E, Long, J D, Mahlstedt, J, Mandrysch, R, Mount, R, Neal, H A, Nisati, A, Nowak, S, Olivares Pino, S A, Pianori, E, Policicchio, A, Price, L E, Radhakrishnan, S K, Richter, R, Robinson, J E, M, Rolli, S, Schmieden, K, Schwegler, Ph, Silva, J, Sivoklokov, S Yu, Soffer, A, Stamen, R, Strizenec, P, Sumida, T, Tashiro, T, Tovey, D R, Tripiana, M F, Trzupek, A, Tskhadadze, E G, Tsybychev, D, Vallecorsa, S, Vives Vaque, F, Vorobel, V, Warsinsky, M, Watkins, P M, Williams, H H, Yacoob, S, Zanello, L, Zimmermann, C, Zitoun, R
• Format: Article
• Language: English
• Subjects: High energy physics
• ISSN: 1029-8479
• DOI: 10.1007/JHEP05(2014)068

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract The production of a W boson in association with a single charm quark is studied using 4.6 fb^sup -1^ of pp collision data at ... = 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 ... at Q ^sup 2^ = 1.9 GeV^sup 2^, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio [sigma](W ^sup +^ +...)/[sigma](W ^sup -^ + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the ... quark asymmetry. [Figure not available: see fulltext.]