FaRe: a Mathematica package for tensor reduction of Feynman integrals

摘要

We present FaRe, a package for Mathematica that implements the decompositionof a generic tensor Feynman integral, with arbitrary loop number, into scalarintegrals in higher dimension. In order for FaRe to work, the package FeynCalcis needed, so that the tensor structure of the different contributions ispreserved and the obtained scalar integrals are grouped accordingly. FaRe canprove particularly useful when it is preferable to handle Feynman integralswith free Lorentz indices and tensor reduction of high-order integrals isneeded. This can then be achieved with several powerful existing tools.