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A Numerical Routine for the Crossed Vertex Diagram with a Massive-Particle Loop

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arxiv 1812.02698 v1 pith:Y2JKVGCD submitted 2018-12-06 hep-ph

A Numerical Routine for the Crossed Vertex Diagram with a Massive-Particle Loop

classification hep-ph
keywords numericalexpansionsintegralsmastercrosseddiagramlooppoints
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present an evaluation of the two master integrals for the crossed vertex diagram with a closed loop of top quarks that allows for an easy numerical implementation. The differential equations obeyed by the master integrals are used to generate power series expansions centered around all the singular points. The different series are then matched numerically with high accuracy in intermediate points. The expansions allow a fast and precise numerical calculation of the two master integrals in all the regions of the phase space. A numerical routine that implements these expansions is presented.

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