π0, η, η' → γγ Decays and the Explicit Chiral Symmetry Breaking

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Abstract

Corrections to the Wess–Zumino–Witten anomaly caused by the explicit breaking of the SU(3)×SU(3)">SU(3)×SU(3) chiral symmetry are studied using the effective meson Lagrangian based on the Nambu–Jona-Lasinio model with the simultaneous expansion in derivatives, current quark masses, and 1/Nc powers. The leading contribution and the first correction for the amplitudes of the π0, η, η' → γγ decays and the contact term in the η/η′→π+π−γ">η/η′→π+π−γ amplitudes have been calculated. The results are compared with similar 1/Nc chiral perturbation calculations and existing experimental data.

About the authors

A. A. Osipov

Joint Institute for Nuclear Research

Author for correspondence.
Email: aaosipov@jinr.ru
Dubna, Moscow region, 141980 Russia

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