Dr Andreas Scharf (SUNY Buffalo)
I want to discuss the next-to-leading order QCD corrections to the production of a top-quark pair in association with a hard photon. This process allows a direct measurement of the top quark electromagnetic couplings. For a realistic description of this process we incorporated top quark and W-boson decays using the narrow width approximation. Photon radiation off top quark decay products is included and yields a significant contribution to the cross section. I will present our findings for ttbar+gamma production at the Tevatron using the selection criteria of a recent CDF analysis. For the LHC I will discuss the impact of the QCD corrections to the ttbar+gamma process on the measurement of the top quark electric charge.