I interpret ψ(3095) and ψ^'(3684) as space and color excitations in a model in which a quark is a composite of a Fermi, spin-{}, ordinary SU(3) object and a Bose, spin-0, color SU(3) object, and a meson is a four-body object. Color conservation and the absence of dipole transitions from the space mode make these two ψ's narrow for nonradiative and for radiative decays, respectively, to the usual hadrons.
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O. W. Greenberg (1975) studied this question.
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