Abstract
We establish the spin structure of matrix elements for processes, where P is a - or -meson, in terms of six scalar amplitudes. Isospin invariance of a strong interaction results in definite symmetry properties of these amplitudes relative to the change ; where is the P-meson production angle. We parametrize all possible polarization observables in using a formalism of structure functions and calculate these structure functions in terms of scalar amplitude. This allows us to establish symmetry properties of polarization observables relative to the transformation . Special attention is devoted to , where isospin invariance simplifies in particular spin structures of matrix elements.
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