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arXiv · 1908.09887

TVID 2: Evaluation of planar-type three-loop self-energy integrals with arbitrary masses

Stefan Bauberger·Ayres Freitas·Daniel Wiegand
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Abstract

We present TVID 2, a program to numerically evaluate an important class of planar three-loop self-energy master integrals with arbitrary masses. As with the predecessor version (TVID 1) the integrals are separated into a known piece, containing the UV divergencies, and a finite piece that is integrated numerically, implemented in C. The set of master integrals under consideration was found with self-energy diagrams containing two closed fermion loops in mind. Two techniques are employed in deriving the expressions for the finite pieces that are then numerically integrated: (a) Sub-loop dispersion relations in the case of topologies containing sub-bubbles, and (b) a modification of the procedure suggested by Ghinculov for integrals with only sub-loop triangles.

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Stefan Bauberger, Ayres Freitas, Daniel Wiegand. 2019-08-26. TVID 2: Evaluation of planar-type three-loop self-energy integrals with arbitrary masses. https://doi.org/10.1007/jhep01(2020)024

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