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Australian Journal of Physics Australian Journal of Physics Society
A journal for the publication of original research in all branches of physics
RESEARCH ARTICLE

h-Meson Decays and Strong UA(1) Breaking in the Three-flavour Nambu–Jona-Lasinio Model


Australian Journal of Physics 50(1) 187 - 198
Published: 1997

Abstract

We study the η → γγ and η → π 0γγ decays using an extended three-flavour Nambu–Jona-Lasinio model that includes the ’t Hooft instanton induced interaction. We find that the η-meson mass, the η → γγ decay width and the η → π 0γγ decay width are in good agreement with the experimental values when the UA(1) breaking is strong and the flavour SU(3) singlet-octet mixing angle θ is about zero. The effects of the UA(1) breaking on the baryon number one and two systems are also studied.

https://doi.org/10.1071/P96047

© CSIRO 1997

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