${\cal O}(αα_s)$ corrections to the $γt\bar{t}$ vertex at the top quark threshold

Kiyo, Yuichiro; Seidel, Dirk; Steinhauser, Matthias

${\cal O}(αα_s)$ corrections to the $γt\bar{t}$ vertex at the top quark threshold

Authors

Kiyo, Yuichiro

Seidel, Dirk

Steinhauser, Matthias

Description

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