Study of Light Scalars in Photon-Photon Collisions, the learned Lessons

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• 作者：N.N. Achasov ; G.N. Shestakov
• 关键词：light scalar mesons ; four-quark states ; chiral shielding ; ? radiative decay mechanisms ; two photon production mechanisms
• 刊名：Nuclear Physics B - Proceedings Supplements
• 出版年：2012
• 出版时间：April-June, 2012
• 年：2012
• 卷：225-227
• 期：Complete
• 页码：135-140
• 全文大小：298 K

文摘

After a short review of the nature of light scalar mesons, we dwell on the investigation of the high-statistics Belle data on two-photon productionof light scalar mesons and ascertain that these data allow us to establish their production mechanisms.

We show that light scalars are produced in two-photon collisions via four-quark transitions in contrast to the classic P-wave tensor mesons which are produced via two-quark transitions . In particular, we show that the ideal model prediction : = 25 : 9 is excluded by experiment. Thus we get new strong evidence of the four-quark nature of these states.

A programme of further investigations is presented.