Here, LagPieceX are the parts of the Lagrangian which shall be added. The option defines if SARAH shall also add the hermitian conjugated to the Lagrangian (AddHC->True). If this option is not set, the hermitian conjugated is not added by default. This option is supposed to be used to define the matter interactions of the potential of a model. It could be used also to define new interactions involving vector bosons. However, this option has to be used carefully since it isn't tested as much as the general purpose.
Terms in the Lagrangina
The parts added to the Lagrangian must have mass dimesion 4 and have the general form: