About

The SMEFTsim package contains a set of models written in FeynRules and pre-exported to the UFO format, that allow automated calculations in the Standard Model Effective Field Theory (SMEFT).

The FeynRules source files can be loaded in Mathematica and used for analytic operations on the SMEFT Lagrangian and for the extraction of the Feynman rules. The UFO models can be imported in Monte Carlo generators, for the simulation of LHC events.

Main features

  1. SMEFTsim implements the complete Warsaw basis of dimension 6 operators.
  2. It contains 10 models that differ in flavor structure and electroweak input parameters choice.
  3. Standard Model Higgs coupling to gluons, γγ and Zγ are implemented in the infinite top mass limit.
  4. It allows to include linearized SMEFT corrections to the propagators of unstable particles in the Monte Carlo event generation.

For further information, see the README file in the GitHub repository and the scientific publications.

Download

The FeynRules source and UFO models are available in the GitHub repository.
It is recommended to download the latest release.

A copy of the latest SMEFTsim release is also stored in the Feynrules database.

Feynman Rules

NEW


Interactive tool to read off SMEFTsim Feynman rules by vertex or by operator
Download from the NotebookArchive (requires Mathematica)

Interactive tool to visualize vertices induced by each SMEFTsim parameter, developed by R. Balasubramanian and S. Swatman
Use in-browser at this link

“SMEFTsimFeyn”: command-line python tool to draw SMEFTsim vertices by operator and export to png, developed by G. Boldrini
Clone from github

Code validation

The UFO models have been validated following the recommendations of arXiv:1906.12310.

The input cards used to translate between models and the PDF files produced as output are available in the
UFO Validation repository.

References

If you use SMEFTsim in a scientific publication, please cite:

  • I. Brivio, Y. Jiang, M. Trott, The SMEFTsim package, theory and tools. JHEP 12 (2017) 070, arXiv: 1709.06492
  • I. Brivio, SMEFTsim 3.0 – a practical guide. JHEP 04 (2021) 073, arXiv: 2012.11343

Contact

For questions, bug reports and feature requests, please submit a GitHub issue,
or send an email to: ilaria.brivio[at]unibo.it