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$\eta^{'} \to \gamma \gamma$ and the topological susceptibility
The radiative decays $\eta'(\eta)\rta\gamma\gamma$ are discussed. The modifications of the conventional PCAC formulae due to the gluonic contribution to the flavour singlet axial anomaly are given. The decay constants satisfy a modified Dashen formula which generalises the Witten--Veneziano for...
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| Lenguaje: | eng |
| Publicado: |
1999
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| Acceso en línea: | https://dx.doi.org/10.1016/S0920-5632(00)00588-0 http://cds.cern.ch/record/395830 |