期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP01(2021)078
关键词
NLO Computations; QCD Phenomenology
资金
- French Agence Nationale pour la Recherche [ANR-17-CE31-0001-01]
- European Research Council (ERC) under the European Union [725110]
- state of Baden-Wurttemberg through bwHPC
- German Research Foundation (DFG) [INST 39/963-1 FUGG]
In this study, the two-loop helicity amplitudes for producing three photons at hadron colliders in QCD were computed using a numerical unitarity method and analytic reconstruction techniques. These amplitudes were decomposed in terms of master integrals in analytic form, and the two-loop finite remainders were efficiently evaluated across the physical phase space. These results were packaged in a public code, making a five-point two-loop process available for immediate phenomenological applications.
We compute the two-loop helicity amplitudes for the production of three photons at hadron colliders in QCD at leading-color. Using the two-loop numerical unitarity method coupled with analytic reconstruction techniques, we obtain the decomposition of the two-loop amplitudes in terms of master integrals in analytic form. These expressions are valid to all orders in the dimensional regulator. We use them to compute the two-loop finite remainders, which are given in a form that can be efficiently evaluated across the whole physical phase space. We further package these results in a public code which assembles the helicity-summed squared two-loop remainders, whose numerical stability across phase-space is demonstrated. This is the first time that a five-point two-loop process is publicly available for immediate phenomenological applications.
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