We apply the recently proposed amplitude reduction at the integrand level method, to the computation of the scatter in g process 2 gamma -> 4 gamma, 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.
Numerical evaluation of six-photon amplitudes
PITTAU, Roberto
2007-01-01
Abstract
We apply the recently proposed amplitude reduction at the integrand level method, to the computation of the scatter in g process 2 gamma -> 4 gamma, 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.
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