\eta(1475) and f_1(1420) resonances in \gamma\gamma* collisions and J/\psi\to\gamma(\rho\rho, \gamma\rho^0, \gamma\phi) decays

TL;DR

This paper explains the $Q^2$ dependence of the $ o Kar K extpi$ reaction cross section through $ ext{eta}(1475)$ resonance production, challenging the conventional $f_1(1420)$ interpretation, and suggests experimental tests to clarify the resonance's properties.

Contribution

It proposes a new interpretation of the $ ext{eta}(1475)$ resonance as the main contributor to the observed data, resolving previous theoretical contradictions.

Findings

$ ext{eta}(1475)$ explains the $Q^2$ dependence of the reaction cross section.

The interpretation resolves the contradiction with the decay width suppression.

Experimental verification of spin-parity is necessary for confirmation.

Abstract

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.