Phenomenological analysis of the properties of narrow resonances and possible evidence for a new quantum number

A phenomenological analysis is carried out to show that the narrow resonances at 3095 and 3685 MeV probably carry a new quantum number which forbids them to decay into ordinary hadrons by strong and medium-strong interactions. It is also shown that the radiative decay modes of these particles are considerably suppressed relative to that of ordinary hadrons. Production in hadronic collisions and photoproduction of these particles are analyzed in this framework. It is suggested that no resonance carrying the same new quantum number can exist with a mass below 2.5 GeV and that the 4.1-GeV resonance can only decay into 3095-MeV and 3685-MeV particles with a width of less than 1 MeV. It is shown, moreover, that the assignment of the ordinary SU(3) quantum numbers of $\omega \mathrm{}\left(783\right)\mathrm{}$ to these states, besides the new quantum number, is favored by experiments.