Abstract
We compute the NNLO QCD corrections for the hadroproduction of a pair of off-shell photons in the limit of a large number of quark flavors. We perform a reduction of the two-loop amplitude to master integrals and calculate the latter analytically as a Laurent series in the dimensional regulator using modern integration methods. Real radiation corrections are evaluated numerically with a direct subtraction of infrared limits which we cast in a simple factorized form. The results presented here constitute a gauge invariant part of the full NNLO corrections but are not necessarily dominant. We view this calculation as a step towards a complete computation. Our partial corrections to the total cross-section are about 1%–3% and vary with the virtuality of the two off-shell photons.
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Anastasiou, C., Cancino, J., Chavez, F. et al. NNLO QCD corrections to pp → γ * γ * in the large N F limit. J. High Energ. Phys. 2015, 182 (2015). https://doi.org/10.1007/JHEP02(2015)182
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DOI: https://doi.org/10.1007/JHEP02(2015)182