Paper detail

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

The available data on the $Q^2$ dependence of the $γγ*(Q^2)\to K\bar Kπ$ reaction cross section in the energy region 1.35-1.55 GeV is explained by the $η(1475)$ 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 $η(1475)\toγγ$ decay width and the strong couplings of the $η(1475)$ to the $ρρ$, $ωω$, and $γρ^0$ channels. The experimental check of our explanation requires definition of the spin-parity of the resonance contributions, $R$, in $γγ*(Q^2)\to R\to K\bar Kπ$ and in $J/ψ\to\gammaR\toγγ(ρ^0, ϕ)$. This will help to solve difficulties accumulated in understanding properties of the $η(1475)$ state and its nearest partners.