Light Scalar Mesons as Manifestation of Spontaneously Broken Chiral Symmetry

TL;DR

This paper investigates the production mechanisms and nature of light scalar mesons, revealing their four-quark structure and connection to spontaneous chiral symmetry breaking, supported by experimental data and theoretical analysis.

Contribution

It demonstrates the four-quark nature of light scalars through kaon loop mechanisms and their production in two-photon collisions, highlighting their relation to chiral symmetry breaking.

Findings

Chiral shielding of the 00 meson is revealed.

Kaon loop mechanism supports four-quark structure of light scalars.

Light scalars are produced via four-quark transitions in two-photon collisions.

Abstract

Attention is paid to the production mechanisms of light scalars that reveal their nature. We reveal the chiral shielding of the \sigma(600) meson. We show that the kaon loop mechanism of the \phi radiative decays, ratified by experiment, points to the four-quark nature of light scalars. We show also that the light scalars are produced in the two photon collisions via four-quark transitions in contrast to the classic P wave tensor q\bar q mesons that are produced via two-quark transitions $\gamma\gamma\to q\bar q$. The history of spontaneous breaking of symmetry in quantum physics is discussed in Appendix.