Abstract
The recently proposed irreducible tensor formalism for hadron scattering and reactions is extended to pion production in $\mathrm{NN}$ collisions and a form akin to that of Wolfenstein for elastic $\mathrm{NN}$ scattering is derived together with exact partial wave expansions for the amplitudes. Explicit formulas are derived for spin observables relevant to differential as well as total cross section measurements employing a polarized beam on a polarized target which are currently of experimental interest.
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