FeynArts model file for MSSM transition counterterms from DREG to DRED

TL;DR

This paper introduces a FeynArts model file that provides counterterms for converting MSSM calculations from dimensional regularization to dimensional reduction, aiding supersymmetric computations.

Contribution

It presents a comprehensive set of analytic counterterms for MSSM, extending Martin/Vaughn counterterms, and offers practical examples for two-loop calculations.

Findings

Provides analytic expressions for MSSM transition counterterms.

Enables consistent supersymmetric renormalization in loop calculations.

Facilitates combining MSbar PDFs with supersymmetric models.

Abstract

The FeynArts model file MSSMdreg2dred.mod implements MSSM transition counterterms which can convert one-loop Green functions from dimensional regularization to dimensional reduction. They correspond to a slight extension of the well-known Martin/Vaughn counterterms, specialized to the MSSM, and can serve also as supersymmetry-restoring counterterms. The paper provides full analytic results for the counterterms and gives one- and two-loop usage examples. The model file can simplify combining MSbar-parton distribution functions with supersymmetric renormalization or avoiding the renormalization of epsilon-scalars in dimensional reduction.