A possible identification of x (3.45) with a “time-like” c excitation

We identify the four observed intermediate states between J/ψ and ψ′ with the four j^PC = j⁺⁺P waves of a relativistic bound state model. Assuming a point-like quark photon vertex we calculate bounds on their radiative couplings to J/ψ and ψ′ by the help of four-dimensional dipole sum rules. These bounds also imply upper bounds on the total widths.