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Fortran subroutines to calculate helicity amplitudes with massive spin-3/2particles, such as massive gravitinos, which couple to the standard model andsupersymmetric particles via the supercurrent, are added to the HELAS (HELicityAmplitude Subroutines) library. They are coded in such a way that arbitraryamplitudes with external gravitinos can be generated automatically by MadGraph,after slight modifications. All the codes have been tested carefully by makinguse of the gauge invariance of the helicity amplitudes.

HELAS and MadGraph with spin-3/2 particles