Two photon decay of the pseudoscalars, the chiral symmetry breaking corrections

Abstract

The extrapolation of the decay amplitudes of the pseudoscalar mesons into two photons from the soft meson limit where it is obtained from the axial-anomaly to the mass shell involves the contribution of the 0^ - continuum. These chiral symmetry breaking corrections turn out to be large. The effects of these corrections on the calculated pi ^0 decay rate, on the values of the singlet-octet mixing angle and on the ratios f_8 / f_pi and f_0 / f_pi are discussed. The implications for the transition form factors gamma gamma* --> pseudoscalars are also evaluated and confronted with the available experimental data.

Computational errors straightened and study of the implications on the form factors of the transitions gamma gamma* --> pseudoscalars added

References in corpus (2)

• Measurements of the Meson-Photon Transition Form Factors of Light Pseudoscalar Mesons at Large Momentum Transfer
• The Goldberger-Treiman Discrepancy in SU(3)

Cited by in corpus (4)

• Chiral expansions of the pi0 lifetime
• A new determination of the $\gamma \pi \to \pi \pi$ anomalous amplitude via ${\pi }^{-}{e}^{-}\to {\pi }^{-}{e}^{-}{\pi }^0$ data
• Couplings of the eta and eta' Mesons to the Nucleon
• Glue content and mixing angle of the eta - eta' system. The effect of the isoscalar 0- continuum