2020 Impact factor 3.043
Hadrons and Nuclei
Eur. Phys. J. A 6, 247-249

Short note

Partial widths for the decays $\eta(1295)\to\gamma\gamma$ and $\eta(1440)\to\gamma\gamma$

A.V. Anisovich1 - V.V. Anisovich1 - V.A. Nikonov1 - L. Montanet2

1 St.Petersburg Nuclear Physics Institute, Gatchina, 188350, Russia
2 CERN, 1211 Geneva 23, Switzerland

Received: 24 September 1999 Communicated by B. Povh

Abstract
We discuss $\gamma\gamma$ partial widths of pseudoscalar/isoscalar mesons $\eta(M) $ in the mass region $M\sim 1000-1500$ MeV. The transition amplitudes $\eta(1295)\to\gamma\gamma$ and $\eta(1440)\to\gamma\gamma$are studied within an assumption that the decaying mesons are the members of the first radial excitation nonet $2^1S_0q\bar q$. 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.

PACS
14.40.Aq $\pi$, K, and $\eta$ mesons - 13.40.Hq Electromagnetic decays


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