We evaluate the fermionic two-loop QCD corrections to the heavy-quark pair production process in the quark-antiquark channel. We obtain analytic results which are valid for any value of the Mandelstam invariants s and t, and of the heavy quark mass m. Our findings confirm previous results for the analytic evaluation in the small-mass limit and numerical results for the exact amplitude. We furthermore provide the expansion of the two-loop amplitude at the production threshold s ~ 4m^2.
@article{arxiv.0806.2301,
title = {Two-Loop Fermionic Corrections to Heavy-Quark Pair Production: the Quark-Antiquark Channel},
author = {R. Bonciani and A. Ferroglia and T. Gehrmann and D. Maitre and C. Studerus},
journal= {arXiv preprint arXiv:0806.2301},
year = {2009}
}