A spinor-helicity calculation confirms the Dirac-Majorana confusion theorem for the process Φ→l+l-νν when the correct antisymmetrization and full spin sum are used.
For example, choose pp1 ∥ ¯k and pp2 ∥ k then all but one of the Majorana amplitudes in eq
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Exploring Quantum Statistics for Dirac and Majorana Neutrinos using Spinor-Helicity techniques
A spinor-helicity calculation confirms the Dirac-Majorana confusion theorem for the process Φ→l+l-νν when the correct antisymmetrization and full spin sum are used.