Glueballs

The G(1440) qualitatively satisfies all criteria for a glueball: it is an isosinglet preferentially produced in hard gluon channels which mediate OZI inhibited processes in an SU(3) symmetric way. A simple pole model is used to predict G → deltaπ, rhoγ, ωγ, phiγ, γγ, rhoππ, and etaππ. The small G → etaππ rate is explained by a cancellation between G → deltaπ → etaππ and G → eta epsilon → etaππ amplitudes which has also been observed in the correponding eta-prime and s(1275) amplitudes. While the G doesn't fit naturally into a pure radially excitation nonet, standard octet-singlet mixing with thetasub(R) = -180 gives results consistent with all existing data. Axial Ward identities accommodate glueball contributions and appear to be consistent with glueball parameters