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The decay width of the process eta -> pi^0 gamma gamma is calculated in theframework of the Nambu-Jona-Lasinio model. The momentum dependence of quarkloops is taken into account. Three types of diagrams are considered: quark box,scalar(a0) and vector(rho, omega) pole diagrams. The obtained estimations arein satisfactory agreement with recent experimental data.Comment: 9 pages, 4 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Process<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi></mml:math>in the Nambu-Jona-Lasinio model

Processη→π0γγin the Nambu-Jona-Lasinio model