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We present the computation of the two-loop form factors for diphotonproduction in the quark annihilation channel. These quantities are relevant forthe NNLO QCD corrections to diphoton production at LHC recently presented inarXiv:2308.10885. The computation is performed retaining full dependence on themass of the heavy quark in the loops. The master integrals are evaluated bymeans of differential equations which are solved exploiting the generalisedpower series technique.

Two-loop form factors for diphoton production in quark annihilation channel with heavy quark mass dependence