Crossed Topology in Two-Loop Dispersive Approach
High Energy Physics - Theory
2018-09-18 v1 High Energy Physics - Phenomenology
Abstract
We extend existing dispersive approach in subloop insertion to the case of crossed two-loop box type topologies. Based on the ideas of the Feynman trick, mass shift approach and dispersive representation of two-point Passarino-Veltman function we expressed two-loop scalar diagrams in the compact analytical form suitable for the automatization of the calculations. The results are expressed in a way that the numerical integration over Feynman and dispersive parameters and differentiation with respect to mass shift parameters are required in the final stage only.
Cite
@article{arxiv.1809.05592,
title = {Crossed Topology in Two-Loop Dispersive Approach},
author = {A. Aleksejevs},
journal= {arXiv preprint arXiv:1809.05592},
year = {2018}
}