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Aad, G.; Albrand, S.; Andrieux, M.L.; Buat, Q.; Clement, B.; Collot, J.; Crépé-Renaudin, S.; Delemontex, T.; Delsart, P.A.; Genest, M.H.; Hostachy, J.Y.; Laisne, E.; Ledroit-Guillon, F.; Lleres, A.; Lucotte, A.; Malek, F.; Martin, P.; Polci, F.; Stark, J.; Sun, X.; Trocmé, B.; Wang, J.; Weydert, C.; Biscarat, C.; Cogneras, E.; Rahal, G.; Abdel Khalek, S.; Abreu, H.; Andari, N.; Arnault, C.; Augé, E.; Barrillon, P.; Benoit, M.; Binet, S.; Bourdarios, C.; Collard, C.; de La Taille, C.; de Vivie de Regie, J.B.; Duflot, L.; Escalier, M.; Fayard, L.; Fournier, D.; Grivaz, J.-F.; Henrot-Versillé, S.; Hrivnac, J.; Iconomidou-Fayard, L.; Idarraga, J.; Kado, M.; Lorenzo Martinez, N.; Lounis, A.; Makovec, N.; Matricon, P.; Niedercorn, F.; Poggioli, L.; Puzo, P.; Renaud, A.; Rousseau, D.; Rybkin, G.; Sauvan, J.B.; Schaarschmidt, J.; Schaffer, A.C.; Scifo, E.; Serin, L.; Simion, S.; Tanaka, R.; Teinturier, M.; Veillet, J.J.; Vukotic, I.; Wicek, F.; Zerwas, D.; Zhang, Z.; Boumediene, D.; Busato, Emmanuel; Calvet, D.; Calvet, S.; Camacho Toro, Reina Coromoto; Cinca, Diane; Donini, J.; Febbraro, R.; Ghodbane, N.; Guicheney, C.; Liao, H.; Pallin, D.; Podlyski, F.; Santoni, C.; Says, L. P.; Vazeille, F.; Aperio Bella, L.; Aubert, B.; Berger, N.; Colas, J.; Delmastro, M.; Di Ciaccio, L.; Doan, T.K.O.; Elles, S.; Goy, C.; Helary, L.; Hryn'Ova, T.; Jérémie, A.; Jézéquel, S.
Physics letters. B, 2012, Letnik: 712Journal Article
Results on the search for flavor-changing neutral-current single top-quark production are reported. Data collected with the ATLAS detector at a center-of-mass energy of sqrt(s) = 7 TeV and corresponding to an integrated luminosity of 2.05 fb^-1 are used. Candidate events with a leptonic top-quark decay signature are classified into signal- and background-like events using a neural network. No signal is observed in the output distribution and a Bayesian upper limit on the production cross-section is placed. The observed 95% C.L. upper limit on the cross-section multiplied by the t -> Wb branching fraction is measured to be sigma(qg -> t) x B(t -> Wb) < 3.9 pb. This upper limit can be converted into an upper limit of the coupling strength k_ugt/Lambda < 6.9 x 10^-3 TeV^-1 and k_cgt/Lambda < 1.6 x 10^-2 TeV^-1 and on the branching fractions B(t -> ug) < 5.7 x 10^-5 and B(t -> cg) < 2.7 x 10^-4.
