Light Scalar Mesons in Photon-Photon Collisions

Understand

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.