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Experimental Discrimination between Charge 2e/3 Top Quark and Charge 4e/3 Exotic Quark Production Scenarios
Baringer, Philip S. Bean, Alice Coppage, Don Gardner, J. Hensel, Carsten Moulik, Tania Wilson, Graham Wallace Abazov, V. M. Abbott, B. Abolins, M.
Baringer, Philip S.
Bean, Alice
Coppage, Don
Gardner, J.
Hensel, Carsten
Moulik, Tania
Wilson, Graham Wallace
Abazov, V. M.
Abbott, B.
Abolins, M.
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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 (tt-bar) produced in pp-bar collisions at 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 b-bar-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 QQ-overbar with |q|=4e/3. We place an upper limit on the fraction of QQ-overbar pairs ρ<0.80 at the 90% C.L.
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This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.98.041801.
Date
2007-01-22
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American Physical Society
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V. M. Abazov et al. (D0 Collaboration). (2007). "Experimental Discrimination between Charge 2e/3 Top Quark and Charge 4e/3 Exotic Quark Production Scenarios." Physical Review Letters, 98(4):041801. http://dx.doi.org/10.1103/PhysRevLett.98.041801.