Numerical evaluation of multi-loop integrals for arbitrary kinematics with SecDec 2.0
Sophia Borowka, Jonathon Carter, Gudrun Heinrich
TL;DR
The program SecDec 2.0 allows the numerical evaluation of multi-loop integrals with no restriction on the kinematics, and contains new useful features for the calculation of more general parameter integrals, related for example to phase space integrals.
Abstract
We present the program SecDec 2.0 which contains various new features: First, it allows the numerical evaluation of multi-loop integrals with no restriction on the kinematics. Dimensionally regulated ultraviolet and infrared singularities are isolated via sector decomposition, while threshold singularities are handled by a deformation of the integration contour in the complex plane. As an application we present numerical results for various massive two-loop four-point diagrams. SecDec 2.0 also contains new useful features for the calculation of more general parameter integrals, related e.g. to phase space integrals.