Exclusion of exotic top-like quarks with -4/3 electric charge using jet-charge tagging in single-lepton ttbar events at CDF
CDF Collaboration: T. Aaltonen, S. Amerio, D. Amidei, A. Anastassov,, A. Annovi, J. Antos, G. Apollinari, J. A. Appel, T. Arisawa, A. Artikov, J., Asaadi, W. Ashmanskas, B. Auerbach, A. Aurisano, F. Azfar, W. Badgett, T., Bae, A. Barbaro-Galtieri, V. E. Barnes, B. A. Barnett
TL;DR
This paper measures the electric charge of the top quark in proton-antiproton collisions, using jet-charge tagging in single-lepton ttbar events, and excludes the existence of an exotic -4/3 charge quark at 99% confidence.
Contribution
It presents a novel measurement technique for top-quark charge using jet-charge tagging in ttbar events at CDF.
Findings
Data is consistent with the standard model.
Excludes exotic quarks with -4/3 charge at 99% confidence.
Uses 5.6 fb^(-1) of data from the CDF II detector.
Abstract
We report on a measurement of the top-quark electric charge in ttbar events in which one W boson originating from the top-quark pair decays into leptons and the other into hadrons. The event sample was collected by the CDF II detector in sqrt(s)=1.96 TeV proton-antiproton collisions and corresponds to 5.6 fb^(-1). We find the data to be consistent with the standard model and exclude the existence of an exotic quark with -4/3 electric charge and mass of the conventional top quark at the 99% confidence level.
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