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Welcome to munuSSM

This is the documentation of the package munuSSM, a tool for the for the phenomenological exploration of the μ-from-ν Supersymmetric Standard Model (μνSSM).

This code contains the full one-loop corrections to the masses of the neutral scalars. Furthermore, an interface to the public code FeynHiggs allows to supplement leading higher-order corrections in the MSSM limit.

Since the expressions for the tree-level couplings and the scalar self energies are huge, they are implented into Fortran modules for a better performance. Calculating the scalar spectrum completes within seconds on a modern computer. In addition, the implementation in Fortran of the couplings and the particle spectrum at the tree level allows for higher floating-point number precision, which is required for a numerically stable prediction of mixing effects that are suppressed by the smallness of R-parity breaking in the μνSSM.

A parameter point can be checked against collider constraints via a link to the HiggsBounds and HiggsSignals libraries. The necessary input, such as effective couplings and branching ratios of the Higgs bosons, are calculated internally.

The stability of the electroweak vacuum as defined via the values of the input parameters can be checked by calculating the euclidean bounce action for each possible transition into a potentially present deeper unphysical minimum. In this way, the user can exclude parameter points when the electroweak vacuum would be short-lived in comparison to the age of the universe.

Citation guide

If you use this software for a scientific publication, we kindly ask you to cite the following papers:

  • Precise predictions for the Higgs-boson masses in the μνSSM
    T. Biekötter (Madrid, IFT & Madrid, Autonoma U.), S. Heinemeyer (Madrid, IFT & Cantabria Inst. of Phys.), C. Muñoz (Madrid, IFT & Madrid, Autonoma U.). Dec 20, 2017 Eur.Phys.J. C78 (2018) no.6, 504 arXiv:1712.07475
  • Precise prediction for the Higgs-Boson masses in the μνSSM with three right-handed neutrino superfields
    T. Biekötter (Madrid, IFT & Madrid, Autonoma U.), S. Heinemeyer (Madrid, IFT & Cantabria Inst. of Phys.), C. Muñoz (Madrid, IFT & Madrid, Autonoma U.). Jun 13, 2019 Eur.Phys.J. C79 (2019) no.8, 667 arXiv:1906.06173
  • munuSSM: A python package for the μ-from-ν Supersymmetric Standard Model
    T. Biekötter (Hamburg, Deutsches Elektronen-Synchrotron (DESY)), Comput.Phys.Commun. 264 (2021) 107935 arXiv:2009.12887
  • Vacuum (meta-)stability in the μνSSM
    T. Biekötter (Hamburg, Deutsches Elektronen-Synchrotron (DESY)), S. Heinemeyer (Madrid, Instituto de Fisica Teorica (IFT)), G. Weiglein (Hamburg, Deutsches Elektronen-Synchrotron (DESY)), arXiv:2112.12132

External software

munuSSM makes use of external software to perform some of the computations. Please also cite the relevant publications for the following software if it is relevant for your work:

Installation

munuSSM is installed with:

make all

The makefile uses pip to install the package to your python environment.

User instructions

The user interface of the package is explained here. You can also find an example script under this link.

Issues

In case you notice any bug or otherwise undesired behaviour, please raise an issue in the gitlab repository.