Ψ particles and new quark models
Krasnikov N.V. , Kuz'min V.A., Chetyrkin K.G.
It is shown that within the framework of models with five or six quarks it is possible to find a natural explanation for the leptonic widths of ψ(3095) and ψ'(3695) and for the invariance of the .K-meson yield in the process <?+e~—> hadrons in the energy interval from 3 to 4.8 GeV. The value of R=<r(e+e~—► hadrons)/o(e+e~—»μ+μ·~) can be reconciled with the experimental data with and without taking the colors of the quarks into account.