Mass

is an option for the routine DefineField that specifies the mass and EFT scaling of the field. The allowed values are either Heavy|Light|0, {Light,0}, {Heavy|Light,mlabel}, or {Heavy|Light,mlabel,{Indices}} where mlabel is a custom label for the mass and Indices must be a subset of the field indices. The default value is Mass->Heavy. If no mlabel is given, the default value Mflabel, with flabel being the label of the corresponding field, is used.