Next-to-next-to-leading order $\mathcal{O}({\alpha }^2{\alpha }_s^2)$ results for top quark pair production in photon--photon collisions: The one-loop squared contributions

J. G. Korner, Z. Merebashvili, M. Rogal

We calculate the one-loop squared contributions to the next-to-next-to-leading order $\mathcal{O}({\alpha }^2{\alpha }_s^2)$ radiative QCD corrections for the production of heavy quark pairs in the c…