Relativistic transition probabilities and form factors have been evaluated in closed form (in terms of hypergeometric functions) for a model of fundamental particles constructed on the unitary irreducible representation space of a noncompact dynamical group. Majorana-type equations have been used to project out irreducible subspaces of the Poincar\'e group and to specify the transformation properties of the electromagnetic current. The magnetic moment of the spin-{} ground state in the simplest representation is -{}, and one obtains the observed symmetry GE(t)=GM(t)μ.
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Barut et al. (1967) studied this question.