SU(4) Explanation of the Narrow Resonances ine+e−Annihilation

Abstract

The narrow resonances at ${M}_{\ensuremath{\psi}}=3.105$ GeV and ${M}_{{\ensuremath{\psi}}^{\ensuremath{'}}}=3.695$ GeV are assigned, together with the familiar SU(3) nonet of vector mesons, as members of the 1 \ensuremath{\bigoplus} 15 representation of SU(4). This leads to a solution consistent with the observed particle spectrum and accounts for the narrow widths of the $\ensuremath{\psi}$ and ${\ensuremath{\psi}}^{\ensuremath{'}}$. The masses of the charmed vector and pseudoscalar mesons are predicted.