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
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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+0.26−0.30 at Q2 = 1.9 GeV2, 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.
AuthorsPurohit, M; Jackson, P; Soni, N; White, MJ; Bouffard, J; Edson, W; Ernst, J; Guindon, S; Jain, V; Butt, AI; Chan, K; Czodrowski, P; Gingrich, DM; Moore, RW; Pinfold, JL; Saddique, A; Sbrizzi, A; Subramania, HS; Vives Vaque, F; Cakir, O; Ciftci, AK; Ciftci, R; Duran Yildiz, H; Kuday, S; Yilmaz, M; Sultansoy, S; Turk Cakir, I; Barnovska, Z; Berger, N; Delmastro, M; Di Ciaccio, L; Doan, TKO; Elles, S; Goy, C; Hryn ova, T; Jézéquel, S; Keoshkerian, H; Koletsou, I; Lafaye, R; Levêque, J; Lombardo, VP; Massol, N; Przysiezniak, H; Sauvage, G; Sauvan, E; Schwoerer, M; Simard, O; Todorov, T; Wingerter-Seez, I; Zitoun, R; Asquith, L; Auerbach, B; Blair, RE; Chekanov, S; Childers, JT; Feng, EJ; Fernando, W; Goshaw, AT; LeCompte, T; Love, J; Malon, D; Nguyen, DH; Nodulman, L; Paramonov, A; Price, LE; Proudfoot, J; Salvachua Ferrando, BM; Stanek, RW; Van Gemmeren, P; Vaniachine, A; Yoshida, R; Zhang, J; Cheu, E; Johns, KA; Kaushik, V; Lampen, CL; Lampl, W; Lei, X; Leone, R; Loch, P; Nayyar, R; O grady, F; Rutherfoord, JP; Shupe, MA; Varnes, EW; Veatch, J; Brandt, A; Côté, D; Darmora, S; De, K; Farbin, A; Griffiths, J; Hadavand, HK; Heelan, L; Kim, HY; Maeno, M; Nilsson, P; Ozturk, N; Pravahan, R; Sosebee, M; et al.
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