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arXiv 1908.098872019-08hep-phhep-th

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

Stefan Bauberger, Ayres Freitas, Daniel Wiegand

备注：: 26 pages, 3 figures, 5 tables. Code available at http://www.pitt.edu/~afreitas/
发表信息：: JHEP 2001 (2020) 024
DOI：: 10.1007/JHEP01(2020)024

英文摘要：

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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