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

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

2001-02-25

arxiv.org/abs/hep-ph/0102302v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevD.66.076012

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.

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