Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-09-29
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 26 pages, 18 postscript figures included with epsfig, uses a4wide.sty. Invited talks given by J. G. K\"orner at the Wor
Scientific paper
We describe in some detail the present features of an automatic loop calculation program as well as the integration techniques that go into it. The program, called XLOOPS 1.0, allows one to calculate massive one- and two-loop Feynman diagrams in the Standard Model including their tensor structure. UV divergences in UV divergent integrals are explicitly computed in dimensional regularization. One-loop integrals are calculated analytically in d \neq 4 dimensions whereas two-loop integrals are reduced to two-fold integral representations which the program evaluates numerically. We discuss Higgs decay at the two-loop level as a first application of the novel integration techniques that are incorporated into XLOOPS.
Frink Alexander
Körner Juergen G.
Tausk J. B.
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