EVEN-PARITY MESON RESONANCES

A recent model of the odd-parity baryon resonances is extended to include even-parity meson resonances. The resonances are assumed coupled to S-wave and D-wave MM states (where M denotes a pseudoscalar or vector meson) with interaction constants such that the resonance pole contributions to the collinear MM→MM scattering amplitudes satisfy SU(6)W symmetry. The relative coupling of the 35-fold and 1-fold M representations is taken in accordance with a bootstrap model. The set of even-parity resonances predicted in this model are octets of jC=0+,1+,2+,1-, and 0+,2+ 1- singlets, where C is the particle-antiparticle conjugation quantum number of the Iz=Y=O particles. The partial widths for MM decays and the principal terms in the mass splitting are computed in the model. The agreement with the present experimental data is good. © 1968 The American Physical Society.