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. Title of program: BOKASUN Catalogue Id: AECG_v1_0 Nature of problem Any integral arising in the evaluation of the two-loop sunrise Feynman diagram can be expressed in terms of a given set of Master Integrals, which should be calculated numerically. The program provides a fast and precise evaluation method of the Master Integrals for arbitrary (but not vanishing) masses and arbitrary value of the external momentum. Versions of this program held in the CPC repository in Mendeley Data AECG_v1_0; BOKASUN; 10.1016/j.cpc.2008.10.011 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)