Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-06
PoSACAT2007:087,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 2 figures, contribution to the proceedings of the ACAT workshop, Amsterdam, April 23-27, 2007
Scientific paper
We present a new approach for obtaining very precise integration results for infrared vertex and box diagrams, where the integration is carried out directly without performing any analytic integration of Feynman parameters. Using an appropriate numerical integration routine with an extrapolation method, together with a multi-precision library, we have obtained integration results which agree with the analytic results to 10 digits even for such a very small photon mass as $10^{-150}$ GeV in the infrared vertex diagram.
Doncker Elise de
Fujimoto Junpei
Hamaguchi Nobuyuki
Ishikawa Tadashi
Shimizu Yasuaki
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