Abstract
We study the η → γγ, η → γμ − μ + and η → π 0 γγ decays using an extended three-flavor Nambu-Jona-Lasinio model that includes the 't Hooft instanton induced U A (1) breaking interaction. We find that the η-meson mass, the η → γγ, η → γμ − μ + and η → π 0 γγ decay widths are in good agreement with the experimental values when the U A (1) breaking is strong and the flavor SU(3) singlet-octet mixing angle θ is about zero.
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