The gauge model of quark--meson interactions and the Higgs status of scalar mesons

TL;DR

This paper develops a gauge model for quark-meson interactions with spontaneous symmetry breaking, explaining scalar mesons as residual Higgs states and matching experimental data on meson processes.

Contribution

It introduces a renormalizable gauge model with broken symmetry that describes low-energy hadron processes and identifies scalar mesons as Higgs-like residual states.

Findings

Calculated radiative widths of vector mesons match experimental data

Effective couplings $g_{VVS}$ agree with observations

Scalar states $a_0(980)$ and $f_0(980)$ are associated with residual Higgs degrees of freedom

Abstract

Electromagnetic and strong hadron processes at low energies are considered in the renormalizable model with the spontaneously broken $U_0(1)\times U(1)\times SU(2)$ gauge symmetry. Calculated radiative widths of vector mesons and effective couplings $g_{VVS}$ agree with the experimental data. Residual Higgs degrees of freedom are associated with scalar states $a_0(980)$ and $f_0(980)$ with the degeneration in masses. Two-gamma decays of $\pi^0-$ and $\sigma-$ mesons are analyzed in detail. To provide an "infrared confinement" a cutoff procedure has been also used in calculations.