Partial widths for the decays eta(1295) -> gamma gamma and eta(1440) -> gamma gamma

Anisovich, A. V.; Anisovich, V. V.; Montanet, L.; Nikonov, V. A.

Partial widths for the decays eta(1295) -> gamma gamma and eta(1440) -> gamma gamma

Authors

Description

We discuss gamma gamma partial widths of pseudoscalar/isoscalar mesons eta(M) in the mass region M = 1000-1500 MeV. The transition amplitudes eta(1295) -> gamma gamma and eta(1440) -> gamma gamma are studied within an assumption that the decaying mesons are the members of the first radial excitation nonet 2^1S_0 q\bar q. The calculations show that partial widths being of the order of 0.1 keV are dominantly due to the n\bar n meson component while the contribution of the s\bar s component is small.
3 pages, LaTeX, 4 EPS figures, epsfig.sty