Golem95: a numerical program to calculate one-loop tensor integrals with up to six external legs
arXiv:0810.0992 · doi:10.1016/j.cpc.2009.06.024
Abstract
We present a program for the numerical evaluation of form factors entering the calculation of one-loop amplitudes with up to six external legs. The program is written in Fortran95 and performs the reduction to a certain set of basis integrals numerically, using a formalism where inverse Gram determinants can be avoided. It can be used to calculate one-loop amplitudes with massless internal particles in a fast and numerically stable way.
30 pages, 2 figures