Relativistic Wave Equations in the Helicity Basis
Abstract
The principal series of unitary representations of the Lorentz group has been considered in the helicity basis. Decompositions of tensor products of the spinspaces are studied in the framework of projective representations of the symmetric group. Higher-spin Gel'fand-Yaglom equations are defined in the helicity basis over an arbitrary representation space. Applications of decomposable and indecomposable Gel'fand-Yaglom equations to particle physics are discussed.
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