Abstract
We are concerned with the theorem of Weinberg and Witten stating that a massless particle of helicity ‖h‖> 1/2 cannot be a carrier of a charge of an internal symmetry induced by a Lorentz covariant current and that for a massless field theory of ‖h‖>1 a Lorentz covariant energy momentum tensor cannot be constructed. We complete the proof of the theorem, as that given by Weinberg and Witten it is inconclusive. We suggest how to evade the difficulties which arise as a consequence of this theorem.
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