Transitional description of mass spectra and radiative decay widths for q anti q mesons in the U(4) model

Mass spectra and radiative decay widths for q anti q mesons taken from well-established results of the Particle Data Group are fit by the O(4)<->U(3) transitional theory of the U(4) vibron model. The results are compared with those of the O(4) limit of the theory and the quark potential model. The O(4)<->U(3) transitional theory seems to give a better description of the heavy q anti q mesons, while the O(4) limit gives an accurate description of the light and strange q anti q mesons. (orig.)