Abstract
Charge symmetry of strong interaction results in a simplified spin structure of amplitude for n+p→d+η in "orthogonal" kinematics, where the η-production angle is equal to 90° in CMS. The presence of singlet and triplet amplitudes in such kinematics induces a rich set of different polarization observables, sensitive to the relative value of these amplitudes. This can be used to test a hypothesis of singlet enhancement of η-production in NN- and [Formula: see text]-collisions, due to a nonperturbative [Formula: see text]-component of the nucleon with special polarization properties.
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