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The reactions pp\to d\pi^+\eta and pn\to d\pi^0\eta are of special interestfor investigating the a_0(980) (J^P=0^+) resonance in the process NN \to da_0\to d\pi\eta. We study some aspects of those reactions within a generalformalism and also in a concrete phenomenological model. In particular, it isshown that the presence of nonresonant (i.e. without excitation of the a_0resonance) contributions to these reactions yields nonvanishing values forspecific polarization observables, i.e. to effects like those generated bya_0-f_0 mixing. An experimental determination of these observables for thereaction pp\to d\pi^+\eta would provide concrete information on the magnitudeof those nonresonant contributions to \pi\eta production. We discuss also thepossibility of extracting information about a_0-f_0 mixing from the reaction pn\to d\pi^0\eta with polarized proton beam.Comment: 14 pages, 3 figure

Angular asymmetries in the reactions $$\vec pp \to d\pi ^ + \eta $$ and $$\vec pn \to d\pi ^0 \eta $$ and a 0-f 0 mixing