${\cal O}(αα_s)$ corrections to the $γt\bar{t}$ vertex at the top quark threshold
arXiv:0810.1597 · doi:10.1088/1126-6708/2009/01/038
Abstract
We compute the last missing piece of the two-loop ${\cal O}(αα_s)$ corrections to $γt \bar{t}$ 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.
22 pages, 8 figures