FeynArts model file for MSSM transition counterterms from DREG to DRED

The FeynArts model file MSSMdreg2dred 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 MS¯-parton distribution functions with supersymmetric renormalization or avoiding the renormalization of ϵ-scalars in dimensional reduction.Program summaryProgram title:MSSMdreg2dred.modCatalogue identifier: AEKR_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEKR_v1_0.htmlProgram obtainable from: CPC Program Library, Queenʼs University, Belfast, N. IrelandLicensing provisions: LGPL-License [1]No. of lines in distributed program, including test data, etc.: 7600No. of bytes in distributed program, including test data, etc.: 197 629Distribution format: tar.gzProgramming language: Mathematica, FeynArtsComputer: Any, capable of running Mathematica and FeynArtsOperating system: Any, with running Mathematica, FeynArts installationClassification: 4.4, 5, 11.1Subprograms used:Cat Id     Title     ReferenceADOW_v1_0  FeynArts   CPC 140 (2001) 418Nature of problem: The computation of one-loop Feynman diagrams in the minimal supersymmetric standard model (MSSM) requires regularization. Two schemes, dimensional regularization and dimensional reduction are both common but have different pros and cons. In order to combine the advantages of both schemes one would like to easily convert existing results from one scheme into the other.Solution method: Finite counterterms are constructed which correspond precisely to the one-loop scheme differences for the MSSM. They are provided as a FeynArts [2] model file. Using this model file together with FeynArts, the (ultra-violet) regularization of any MSSM one-loop Green function is switched automatically from dimensional regularization to dimensional reduction. In particular the counterterms serve as supersymmetry-restoring counterterms for dimensional regularization.Restrictions: The counterterms are restricted to the one-loop level and the MSSM.Running time: A few seconds to generate typical Feynman graphs with FeynArts.References:[1]http://www.gnu.org/licenses/lgpl.html.[2]T. Hahn, Comput. Phys. Commun. 140 (2001) 418, arXiv:hep-ph/0012260;T. Hahn, C. Schappacher, Comput. Phys. Commun. 143 (2002) 54, arXiv:hep-ph/0105349.