WCxf: An exchange format for Wilson coefficients beyond the Standard Model

Jason Aebischer, Ilaria Brivio, Alejandro Celis, Jared A. Evans, Yun Jiang, Jacky Kumar, Xuanyou Pan, Werner Porod, Janusz Rosiek, David Shih, Florian Staub, David M. Straub, Danny van Dyk, Avelino Vicente

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


We define a data exchange format for numerical values of Wilson coefficients of local operators parameterising low-energy effects of physics beyond the Standard Model. The format facilitates interfacing model-specific Wilson coefficient calculators, renormalisation group (RG) runners, and observable calculators. It is designed to be unambiguous (defining a non-redundant set of operators with fixed normalisation in each basis), extensible (allowing the addition of new EFTs or bases by the user), and robust (being based on industry standard file formats with parsers implemented in many programming languages). We have implemented the format for the Standard Model EFT (SMEFT) and for the weak effective theory (WET) below the electroweak scale and have added interfaces to a number of public codes dealing with SMEFT or WET. We also provide command-line utilities and a Python module for convenient manipulation of WCxf files, including translation between different bases and matching from SMEFT to WET.

Original languageEnglish (US)
Pages (from-to)71-83
Number of pages13
JournalComputer Physics Communications
StatePublished - Nov 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Hardware and Architecture


  • High energy physics and computing
  • Models beyond the standard model


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