Discovered more than forty years ago and from the very start a stumbling block for the naive quark—antiquark model, light scalar mesons are virtually universally believed to be nontrivial in nature today. A major contribution to understanding the nature of light scalar mesons has come from the physics of photon—photon collisions, a field which has recently entered the era of high-precision statistics. In this paper, conclusions from current experimental data concerning the mechanisms of the two-photon creation of light scalar mesons are reviewed.

PACS: 12.39.−x, 13.40.−f, 13.60.Le, 13.75.Lb (all) DOI: 10.3367/UFNe.0181.201108b.0827 URL: https://ufn.ru/en/articles/2011/8/b/ 000298410800002 2-s2.0-81255176442 2011PhyU...54..799A Citation: Achasov N N, Shestakov G N "Light scalar mesons in photon—photon collisions" Phys. Usp. 54 799–828 (2011) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Received: 15th, September 2010, revised: 19th, October 2010, accepted: 27th, October 2010 Оригинал: Ачасов Н Н, Шестаков Г Н «Лёгкие скалярные мезоны в фотон-фотонных столкновениях» УФН 181 827–857 (2011); DOI: 10.3367/UFNr.0181.201108b.0827