Two-body decays of radially excited $\eta(1295)$ and $\eta(1475)$ mesons in the extended NJL model

In the extended NJL model, two-body strong decays of the radially excited $\eta(1295)$ and $\eta(1475)$ mesons are described. It is shown that the two-body decays $\eta(1475)\to K_0^*K, a_0\pi$ play a dominant role in determining the width of the radially excited meson $\eta(1475)$. At the same time, the decays $\eta(1475)\to K^*K$ make a significantly smaller contribution to the total width. It is shown that two-particle decays give only a negligible contribution to the total width of the $\eta(1295)$.

M.K. Volkov, A.A. Pivovarov, K. Nurlan · 2026