Light Scalar Mesons in Photon-Photon Collisions
N.N. Achasov, G.N. Shestakov

TL;DR
This paper reviews how high-statistics two-photon experiments have advanced understanding of the complex nature of light scalar mesons, challenging simple quark-antiquark models.
Contribution
It provides a comprehensive analysis of recent experimental data on two-photon production of light scalar mesons, highlighting new insights into their structure.
Findings
Two-photon production mechanisms reveal complex meson structures.
High-statistics data improve understanding of scalar meson nature.
Experimental results challenge naive quark-antiquark models.
Abstract
The light scalar mesons, discovered over forty years ago, became a challenge for the naive quark-antiquark model from the outset. At present the nontrivial nature of these states is no longer denied practically anybody. Two-photon physics has made a substantial contribution to understanding the nature of the light scalar mesons. Recently, it entered a new stage of high statistics measurements. We review the results concerning two-photon production mechanisms of the light scalars, based on the analysis of current experimental data.
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