Decays of High-Spin Objects Produced by Pion Exchange

The OPE-$\delta$ prescription for approximating the absorptive one-pion-exchange (OPE) predictions for spin-density matrix elements has been applied to quasi-two-body reactions with final-state particles of arbitrary spins. Results indicate that the model is able to give the qualitative features of usual absorptive-one-pion-exchange (OPEA) models. Agreement between OPE-$\delta$ and OPEA predictions is good in general. Predictions of the two models for diagonal density matrix elements for the reaction $\pi +N\to f^0+N$ tend to disagree at larger angles.