Exclusion of an Exotic Top Quark with -4/3 Electric Charge Using Soft Lepton Tagging
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We present a measurement of the electric charge of the top quark using pp collisions corresponding to an integrated luminosity of 2.7 fb(-1) at the CDF II detector. We reconstruct tt events in the lepton + jets final state. We use soft lepton taggers to determine the flavor of the b jets, which we use to reconstruct the top quark's electric charge and exclude an exotic top quark with -4/3 charge at 95% confidence level. This is the strongest exclusion of the exotic charge scenario and the first to use soft leptons for this purpose.
author list (cited authors)
Aaltonen, T., Adelman, J., González, B., Amerio, S., Amidei, D., Anastassov, A., ... Zucchelli, S.