1307.4568 (The ATLAS Collaboration)

Measurement of the top quark charge in pp collisions at sqrt(s) = 7 TeV
with the ATLAS detector    [PDF]

The ATLAS Collaboration

A measurement of the top quark electric charge is carried out in the ATLAS experiment at the Large Hadron Collider using 2.05 fb-1 of data at a centre-of-mass energy of 7 TeV. In units of the elementary electric charge, the top quark charge is determined to be 0.64 +- 0.02 (stat.) +- 0.08 (syst.) from the charges of the top quark decay products in single lepton ttbar candidate events. This excludes models that propose a heavy quark of electric charge --4/3, instead of the Standard Model top quark, with a significance of more than 8 sigma.

View original: http://arxiv.org/abs/1307.4568