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.
@article{arxiv.0704.1271,
title = {Numerical Evaluation of Six-Photon Amplitudes},
author = {Giovanni Ossola and Costas G. Papadopoulos and Roberto Pittau},
journal= {arXiv preprint arXiv:0704.1271},
year = {2009}
}
Comments
21 pages, 3 figures. Version accepted for publication in JHEP