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We present the first experimental discrimination between the 2e/3 and 4e/3top quark electric charge scenarios, using top quark pairs (ttbar) produced inppbar collisions at sqrt{s}=1.96 TeV by the Fermilab Tevatron collider. We use370 pb-1 of data collected by the D0 experiment and select events with at leastone high transverse momentum electron or muon, high transverse energyimbalance, and four or more jets. We discriminate between b- and bbar-quarkjets by using the charge and momenta of tracks within the jet cones. The datais consistent with the expected electric charge, |q|=2e/3. We exclude, at the92% C.L., that the sample is solely due to the production of exotic quark pairsQQbar with |q|=4e/3. We place an upper limit on the fraction of QQbar pairs fq< 0.80 at the 90% C.L.

physical review letters

Experimental Discrimination between Charge<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi>e</mml:mi><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:math>Top Quark and Charge<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mi>e</mml:mi><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:math>Exotic Quark Production Scenarios

Experimental Discrimination between Charge2e/3Top Quark and Charge4e/3Exotic Quark Production Scenarios