Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 5 figures, Talk given at 3rd Computational Particle Physics Workshop CPP2010, September 23-25, 2010, KEK Japan
Scientific paper
In this paper, we describe a numerical approach to evaluate Feynman loop integrals. In this approach the key technique is a combination of a numerical integration method and a numerical extrapolation method. Since the computation is carried out in a fully numerical way, our approach is applicable to one-, two- and multi-loop diagrams. Without any analytic treatment it can compute diagrams with not only real masses but also complex masses for the internal particles. As concrete examples we present numerical results of a scalar one-loop box integral with complex masses and two-loop planar and non-planar box integrals with masses. We discuss the quality of our numerical computation by comparisons with other methods and also propose a self consistency check.
Doncker Elise de
Fujimoto Junpei
Hamaguchi Nobuyuki
Ishikawa Tadashi
Kato Kazuhiro
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