HAL : in2p3-00089859, version 1
 arXiv : hep-ex/0608044
 Physical Review Letters 98 (2007) 041801
 Experimental discrimination between charge 2e/3 top quark and charge 4e/3 exotic quark production scenarios
 D0 Collaboration(s)
 (2007)
 We present the first experimental discrimination between the 2e/3 and 4e/3 top quark electric charge scenarios, using top quark pairs (ttbar) produced in ppbar collisions at sqrt{s}=1.96 TeV by the Fermilab Tevatron collider. We use 370 pb-1 of data collected by the D0 experiment and select events with at least one high transverse momentum electron or muon, high transverse energy imbalance, and four or more jets. We discriminate between b- and bbar-quark jets by using the charge and momenta of tracks within the jet cones. The data is consistent with the expected electric charge, |q|=2e/3. We exclude, at the 92% C.L., that the sample is solely due to the production of exotic quark pairs QQbar with |q|=4e/3. We place an upper limit on the fraction of QQbar pairs fq < 0.80 at the 90% C.L.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/hep-ex/0608044
 in2p3-00089859, version 1 http://hal.in2p3.fr/in2p3-00089859 oai:hal.in2p3.fr:in2p3-00089859 Contributeur : Sylvie Florès <> Soumis le : Jeudi 24 Août 2006, 11:55:54 Dernière modification le : Jeudi 9 Août 2007, 10:31:29