Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-08-16
Phys.Rev.Lett.98:041801,2007
Physics
High Energy Physics
High Energy Physics - Experiment
Published in Phys. Rev. Lett. 98, 041801 (2007) - Minor changes in v2 to match the published version
Scientific paper
10.1103/PhysRevLett.98.041801
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.
"D0 Collaboration
Abazov V.
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