Heavy-Quark Form Factors and Threshold Cross Section at O(αₛ²)

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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 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⁻ → Q Q cross section, and the forward-backward asymmetry of heavy quarks. Here the Q Q threshold cross section is presented with some new second order axial vector contributions.