出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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
10150 GeV in the infrared vertex diagram.
