During the last year, analytic expressions for the two-loop QCD corrections
to the form factors for the vector, axial-vector, scalar and pseudo-scalar
vertices involving a pair of heavy quarks, QQˉ​, were calculated. The
results are valid for arbitrary momentum transfer and mass of the heavy quarks.
These form factors have a number of applications, including anomalous
couplings, the e+e−→QQˉ​ cross section, and the
forward-backward asymmetry of heavy quarks. Here the QQˉ​ threshold
cross section is presented with some new second order axial vector
contributions.Comment: 5 pages. Presented at the International Europhysics Conference on
High Energy Physics (HEP2005), July 21-27 2005, Lisboa, Portuga