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[Licence| Download | New Version Template] aekr_v1_0.tar.gz(192 Kbytes)
Manuscript Title: FeynArts model file for MSSM transition counterterms from DREG to DRED
Authors: Dominik Stöckinger, Philipp Varso
Program title: MSSMdreg2dred.mod
Catalogue identifier: AEKR_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 183(2012)422
Programming language: Mathematica, FeynArts.
Computer: Any, capable of running Mathematica and FeynArts.
Operating system: Any, with running Mathematica, FeynArts installation.
Keywords: FeynArts model file, MSSM, Dimensional regularization.
Classification: 4.4, 5, 11.1.

Subprograms used:
Cat Id Title Reference
ADOW_v1_0 FeynArts CPC 140(2001)418

Nature 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 [1] 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] T. Hahn, Comput. Phys. Commun. 140 (2001) 418
[arXiv:hep-ph/0012260].
T. Hahn and C. Schappacher, Comput. Phys. Commun. 143 (2002) 54 [arXiv:hep-ph/0105349].