η(1475) and f_1(1420) resonances in γγ* collisions and J/ψ\toγ(ρρ, γρ^0, γφ) decays

N. N. Achasov, G. N. Shestakov

Published 2011-05-04, updated 2011-08-27Version 2

The available data on the $Q^2$ dependence of the $\gamma\gamma*(Q^2)\to K\bar K\pi$ reaction cross section in the energy region 1.35-1.55 GeV is explained by the $\eta(1475)$ resonance production in contrast to their conventional interpretation with the use of the $f_1(1420)$ resonance. It resolves theoretically the contradiction between the suppression of the $\eta(1475)\to\gamma\gamma$ decay width and the strong couplings of the $\eta(1475)$ to the $\rho\rho$, $\omega\omega$, and $\gamma\rho^0$ channels. The experimental check of our explanation requires definition of the spin-parity of the resonance contributions, $R$, in $\gamma\gamma*(Q^2)\to R\to K\bar K\pi$ and in $J/\psi\to\gammaR\to\gamma\gamma(\rho^0, \phi)$. This will help to solve difficulties accumulated in understanding properties of the $\eta(1475)$ state and its nearest partners.