NNLO QCD corrections to pp -> gamma* gamma* in the large NF limit
(2015) Journal of High Energy Physics — Vol. 2015, n° 2, p. 182 (2015)
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- 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.
- Affiliations
University of Durham Department of Physics
Citations
Anastasiou, C., Cancino, J., Chavez, F., Duhr, C., Lazopoulos, A., Mistlberger, B., & Müller, R. (2015). NNLO QCD corrections to pp -> gamma* gamma* in the large NF limit. Journal of High Energy Physics, 2015(2), 182. https://doi.org/10.1007/JHEP02(2015)182 (Original work published 2015)