NNLO QCD corrections to $pp \to ��^* ��^*$ in the large $N_F$ limit
| Autor: | Anastasiou, Charalampos, Cancino, Julian, Chavez, Federico, Duhr, Claude, Lazopoulos, Achilleas, Mistlberger, Bernhard, Mueller, Romain |
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| Rok vydání: | 2014 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1408.4546 |
| Popis: | 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. 53 pages |
| Databáze: | OpenAIRE |
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