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The spinor helicity formalism (SHF) has been efficiently applied to computeperturbative amplitudes in plenty of processes and reactions in gauge theories(including gravity), mostly in the massless case. Some work has been done inorder to extend the SHF to the massive case. We have used these powerful toolsto evaluate amplitudes in a local supersymmetric model where the gravitino isthe lightest supersymmetric particle (LSP). Two decays have been evaluated inorder to show the capability of the SHF in the massive extension, namely thetwo body neutralino decays $\tilde{\chi}_0\to V\tilde{\Psi}^{\mu}$ with$V=\gamma, Z$. The comparisons of amplitudes with spin-3/2 gravitino andspin-1/2 goldstino are also presented.

Helicity Amplitudes for production of massive gravitino/goldstino