Title: "Measurement of Top Quark's Charge at CDF"

Abstract:

We present the first CDF measurement of the top quark's charge using its decay products based on close to 1 fb^-1 of data. The Standard Model predicts the top charge to be +2/3 but alternative theories allow a fourth generation exotic quark with a charge of -4/3. We classify events as top like or exotic like depending on the the charge of the b jet and the associated W boson. We determine the charge of the b jet using the jet charge algorithm which sums up the charge of each momentum weighted track within the jet. We find the p-value under the SM hypothesis to be 0.35. Our p-value is consistent with the SM, and excludes the exotic quark hypothesis with 81% confidence, for which we have chosen a priori that the probability of incorrectly rejecting the SM would be 1%.