Abstract
The effective lagrangian for the U(1) problem is reanalysed on the basis of the color gauge invariance of the underlying QCD. The decoupling mechanism of the axial-vector ghost from the physical sector is investigated with a particular gauge-fixing condition. The model is then extended to incorporate flavor degrees of freedom. It is explicitly demonstrated that the suppression mechanism for η→3 π is evaded in a manner consistent with anomalous Ward-Takahashi identities for the U(1) current without massless Nambu-Goldstone boson. The decays of ϑ→ η( η′) γ are also estimated under the assumption that the decay in question dominantly proceeds through 2 gluons+γ with 2 gluons in the 1S 0 state. Finally, strong CP violation is briefly discussed.
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