Process eta -> pi0 gamma gamma in the Nambu-Jona-Lasinio model
Abstract
The decay width of the process eta -> pi0 gamma gamma is calculated in the framework of the Nambu-Jona-Lasinio model. The momentum dependence of quark loops is taken into account. Three types of diagrams are considered: quark box, scalar(a0) and vector(rho, omega) pole diagrams. The obtained estimations are in satisfactory agreement with recent experimental data.
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