FeynCalc manual (development version)

Custom FeynRules models

See also

Overview.

If you want to create new FeynArts models using FeynRules, please keep in mind that those models must be patched for compatibility with FeynCalc before they can be used for calculations.

The patching is done by using the function FAPatch with the option PatchModelsOnly set to True

• If the model is located inside the Models directory of $FeynArtsDirectory, it is sufficient to evaluate FAPatch[PatchModelsOnly -> True] after loading FeynCalc and FeynArts in the usual way.
• If the model has been placed into a separate directory, use FAPatch[PatchModelsOnly -> True, FAModelsDirectory -> "fullPathToMyModelDir"]

The patching has to be done only once for each new model. However, rerunning FAPatch[PatchModelsOnly -> True] would not do any harm, so if you often modify existing or add new models, you might want to keep this command in your working notebooks.