Remarks on models for theJand otherψparticles

Abstract

We make some comments concerning charm-related models, the Schwinger phenomenological theory, and a possible multiplicative $t$ quantum-number scheme for the $J$ and other $\psi$ particles. It is seen that an accurate measurement of the rate $J^0\to {\pi }^{+}+{\pi }^{-}+\gamma$, a search for narrow-width $(I^G,J^P)=(1^{\pm },1^{\mp })$ particles (with the vector particle probably below 3.1 GeV), and a possible enhanced pair production of ($\mathrm{JJ}$) and ($J\psi$) in hadron-initiated reactions at high energies remain of substantial interest in sorting out our options.