GENERAL-ANALYSIS OF THE POLARIZATION EFFECTS IN N-]D+P PROCESSES(N)

We establish the spin structure of matrix elements for N + N --> d + P processes, where P is a pi- or eta-meson, in terms of six scalar ampl itudes. Isospin invariance of a strong interaction results in definite symmetry properties of these amplitudes relative to the change cos th eta --> -cos theta; where theta is the P-meson production angle. We pa rametrize all possible polarization observables in n + p --> d + P usi ng a formalism of structure functions and calculate these structure fu nctions in terms of scalar amplitude. This allows us to establish symm etry properties of polarization observables relative to the transforma tion cos theta --> -cos theta. Special attention is devoted to theta = 90 degrees, where isospin invariance simplifies in particular spin st ructures of matrix elements.