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Experimental discrimination between charge 2e/3 top quark and charge 4e/3 exotic quark production scenarios.

Abazov, V. M. and Bertram, Iain and Borissov, Guennadi and Fox, Harald and Ratoff, Peter and Sopczak, Andre (2007) Experimental discrimination between charge 2e/3 top quark and charge 4e/3 exotic quark production scenarios. Physical Review Letters, 98. 041801. ISSN 1079-7114

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Abstract

We present the first experimental discrimination between the 2e/3 and 4e/3 top quark electric charge scenarios, using top quark pairs (t) produced in p collisions at =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 -quark jets by using the charge and momenta of tracks within the jet cones. The data are 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 Q with |q|=4e/3. We place an upper limit on the fraction of Q pairs <0.80 at the 90% C.L.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 11260
Deposited By: Dr Iain Bertram
Deposited On: 12 Aug 2008 11:19
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 14:59
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/11260

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