Next-to-next-to-leading order $\mathcal{O}({\alpha }_s^4)$ results for heavy quark pair production in quark--antiquark collisions: The one-loop squared contributions

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

We calculate the next-to-next-to-leading order $\mathcal{O}({\alpha }_s^4)$ one-loop squared corrections to the production of heavy quark pairs in quark-antiquark annihilations. These are par…