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ftint: : Calculating gradient-flow integrals with pySecDec
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DOI：10.1016/j.cpc.2024.109384.png)
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Abstract
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The program ftint is introduced which numerically evaluates dimensionally regularized integrals as they occur in the perturbative approach to the gradient-flow formalism in quantum field theory. It relies on sector decomposition in order to determine the coefficients of the individual orders in & varepsilon;=(4-D)/2, where D is the space-time dimension. For that purpose, it implements an interface to the public library pySecDec. The current version works for massive and massless integrals up to three-loop level with vanishing external momenta, but the underlying method is extendable to more general cases.
Keywords:
Gradient flow
Perturbation theory
Feynman integrals
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