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+====== TTP08-43 ${\cal O}(\alpha\alpha_s)$ corrections to the $\gamma t\bar{t}$ vertex at the top quark threshold ======
+      <hidden TTP08-43  ${\cal O}(\alpha\alpha_s)$ corrections to the $\gamma t\bar{t}$ vertex at the top quark threshold > 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.
+ </hidden>
+|**Yuichiro Kiyo, Dirk Seidel, Matthias Steinhauser**  |
+|**  JHEP  0901 038 2009  **  |
+| {{preprints:2008:ttp08-43.pdf|PDF}} {{preprints:2008:ttp08-43.ps|PostScript}} [[http://arxiv.org/abs/0810.1597|arXiv]] [[http://ttp.kit.edu/Progdata/ttp08/ttp08-43|Programs and Data]]   |
+| |