arXiv:0704.1271·v2·High Energy Physics — Phenomenology
Numerical Evaluation of Six-Photon Amplitudes
Giovanni Ossola🇬🇷 · Costas G. Papadopoulos (Democritos Nucl. Res. Ctr.)🇬🇷 · Roberto Pittau (Turin U. & INFN, Turin)🇮🇹
Abstract
We apply the recently proposed amplitude reduction at the integrand level method, to the computation of the scattering process 2 photons -> 4 photons, including the case of a massive fermion loop. We also present several improvements of the method, including a general strategy to reconstruct the rational part of any one-loop amplitude and the treatment of vanishing Gram-determinants.
Comments: 21 pages, 3 figures. Version accepted for publication in JHEP