Journal
COMPUTER PHYSICS COMMUNICATIONS
Volume 175, Issue 8, Pages 559-571Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cpc.2006.07.002
Keywords
Mellin-Barnes integrals; analytic continuation; numerical evaluation; Feynman integrals
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This paper describe a package written in MATHEMATICA that automatizes typical operations performed during evaluation of Feynman graphs with Mellin-Barnes (MB) techniques. The main procedure allows to analytically continue a MB integral in a given parameter without any intervention from the user and thus to resolve the singularity structure in this parameter. The package can also perform numerical integrations at specified kinematic points, as long as the integrands have satisfactory convergence properties. It is demonstrated that, at least in the case of massive graphs in the physical region, the convergence may turn out to be poor, making naive numerical integration of MB integrals unusable. Possible solutions to this problem are presented, but full automatization in such cases may not be achievable.
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