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.
In fact, we can show the interference term for the anti-symmetrization of type B has effectively no physical meaning
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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.