The Implementation of the Renormalized Complex MSSM in FeynArts and FormCalc

TL;DR

This paper details the implementation of a renormalized complex MSSM model in FeynArts and FormCalc, enabling automated, UV-finite one-loop calculations for various processes within this supersymmetric framework.

Contribution

It introduces a new model file for FeynArts that incorporates the renormalized complex MSSM with default renormalization constants, tested for stability across parameter space.

Findings

Model file enables automatic one-loop calculations in cMSSM.

Renormalization scheme provides stable results across parameter space.

Extensive testing confirms reliability for decay and scattering processes.

Abstract

We describe the implementation of the renormalized complex MSSM (cMSSM) in the diagram generator FeynArts and the calculational tool FormCalc. This extension allows to perform UV-finite one-loop calculations of cMSSM processes almost fully automatically. The Feynman rules for the cMSSM with counterterms are available as a new model file for FeynArts. Also included are default definitions of the renormalization constants; this fixes the renormalization scheme. Beyond that all model parameters are generic, e.g. we do not impose any relations to restrict the number of input parameters. The model file has been tested extensively for several non-trivial decays and scattering reactions. Our renormalization scheme has been shown to give stable results over large parts of the cMSSM parameter space.