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We present a measurement of the electric charge of the top quark using$\ppbar$ collisions corresponding to an integrated luminosity of 2.7~fb$^{-1}$at the CDF II detector. We reconstruct $\ttbar$ events in the lepton+jets finalstate and use kinematic information to determine which $b$-jet is associatedwith the leptonically- or hadronically-decaying $t$-quark. Soft lepton taggersare used to determine the $b$-jet flavor. Along with the charge of the $W$boson decay lepton, this information permits the reconstruction of the topquark's electric charge. Out of 45 reconstructed events with $2.4\pm0.8$expected background events, 29 are reconstructed as $\ttbar$ with the standardmodel $+$2/3 charge, whereas 16 are reconstructed as $\ttbar$ with an exotic$-4/3$ charge. This is consistent with the standard model and excludes theexotic scenario at 95\% confidence level. This is the strongest exclusion ofthe exotic charge scenario and the first to use soft leptons for this purpose.

Exclusion of an Exotic Top Quark with -4/3 Electric Charge Using Soft Lepton Tagging