Numerical Evaluation of Six-Photon Amplitudes

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.

21 pages, 3 figures. Version accepted for publication in JHEP

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