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In these proceedings a recent calculation of the last missing piece of thetwo-loop O(alpha alpha(s)) corrections to gamma t anti-t vertex at the t anti-tthreshold due to the exchange of a W boson and a gluon is summarised. Thecalculation constitutes a building block of the top quark threshold productioncross section at electron positron colliders.

Threshold corrections to the gamma t anti-t vertex at O(alpha alpha(s))