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{cal O}(αα_s) corrections to the γ tbar{t} vertex at the top quark threshold
classification
✦ hep-ph
keywords
alphathresholdcorrectionsgammaquarkvertexblockboson
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We compute the last missing piece of the two-loop ${\cal O}(\alpha \alpha_s)$ corrections to $\gamma t \bar{t}$ vertex at the $t \bar{t}$ threshold due to the exchange of a $W$ boson and a gluon. This contribution constitutes a building block of the top quark threshold production cross section at electron positron colliders.
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