Heavy quark pair production in gluon fusion at next-to-next-to-leading ${\cal O}(α_s^4)$ order: One-loop squared contributions

B. Kniehl; J. G. Körner; Z. Merebashvili; M. Rogal

Paper

Heavy quark pair production in gluon fusion at next-to-next-to-leading ${\cal O}(α_s^4)$ order: One-loop squared contributions

Abstract

We calculate the next-to-next-to-leading order

one-loop squared corrections to the production of heavy-quark pairs in the gluon-gluon fusion process. Together with the previously derived results on the

production channel the results of this paper complete the calculation of the one-loop squared contributions of the next-to-next-to-leading order

radiative QCD corrections to the hadroproduction of heavy flavors. Our results, with the full mass dependence retained, are presented in a closed and very compact form, in dimensional regularization.