Heavy-Quark Form Factors and Threshold Cross Section at O(\alpha_S^2)
  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, $Q \bar{Q}$, 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 $e^{+}e^{-} \to Q \bar Q$ cross section, and the forward-backward asymmetry of heavy quarks. Here the $Q {\bar Q}$ threshold cross section is presented with some new second order axial vector contributions. 
W. Bernreuther, R. Bonciani, T. Gehrmann, R. Heinesch, T. Leineweber,   P. Mastrolia and E. Remiddi