Measurement of the Electric Charge of the Top Quark in $\mathbf{t}\bar{\mathbf{t}}$ Events

Abstract

We present a measurement of the electric charge of top quarks using $t\bar{t}$ events produced in $p\bar{p}$ collisions at the Tevatron. The analysis is based on fully reconstructed $t\bar{t}$ pairs in lepton+jets final states. Using data corresponding to 5.3 $\mathrm{f}{\mathrm{b}}^{-1}$ of integrated luminosity, we exclude the hypothesis that the top quark has a charge of $Q=-4/3e$ at a significance greater than 5 standard deviations. We also place an upper limit of 0.46 on the fraction of such quarks that can be present in an admixture with the standard model top quarks ($Q=+2/3e$) at a 95\% confidence level.

8 pages, 4 figures, submitted to Phys. Rev. D

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