The Two Loop Crossed Ladder Vertex Diagram with Two Massive Exchanges

Details The Two Loop Crossed Ladder Vertex Diagram with Two Massive Exchanges The Two Loop Crossed Ladder Vertex Diagram with Two Massive Exchanges

2007-05-17

arxiv.org/abs/0705.2616v1

Nucl.Phys.B789:45-83,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

42 pages, 1 figure

Scientific paper

10.1016/j.nuclphysb.2007.07.019

We compute the (three) master integrals for the crossed ladder diagram with two exchanged quanta of equal mass. The differential equations obeyed by the master integrals are used to generate power series expansions centered around all the singular (plus some regular) points, which are then matched numerically with high accuracy. The expansions allow a fast and precise numerical calculation of the three master integrals (better than 15 digits with less than 30 terms in the whole real axis). A conspicuous relation with the equal-mass sunrise in two dimensions is found. Comparison with a previous large momentum expansion is made finding complete agreement.

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