BOKASUN: a fast and precise numerical program to calculate the Master Integrals of the two-loop sunrise diagrams

Abstract

We present the program BOKASUN for fast and precise evaluation of the Master Integrals of the two-loop self-mass sunrise diagram for arbitrary values of the internal masses and the external four-momentum. We use a combination of two methods: a Bernoulli accelerated series expansion and a Runge-Kutta numerical solution of a system of linear differential equations.

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• Algorithms and tools for iterated Eisenstein integrals
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