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VOLUME 52 (1990) | ISSUE 4 | PAGE 837
Multivalued action functionals, Lorentz harmonics, and spin
The quantization of the helicity of massless particles (end of supersymmetric multiplets) is shown to be a consequence of a multivaluedness of the action functional of a new twistor-harmonic formulation. A new and purely topological proof of the quantization of the helicity in units of fi/2 is given.