Nature of light scalars through photon-photon collisions

摘要：

The surprising thing is that arising almost 50 years ago from the linear sigma model(LSM)with spontaneously broken chiral symmetry,the light scalar meson problem has become central in the nonperturbative quantum chromodynamics(QCD)for it has been made clear that LSM could be the low energy realization of QCD.First we review briefly signs of four-quark nature of light scalars.Then we show that the light scalars are produced in the two photon collisions via four-quark transitions in contrast to the classic P wave tensor q(q)mesons that are produced via two-quark transitions γγ→q(q).Thus we get new evidence of the four-quark nature of these states.

关键词： linear sigma model light scalar mesons four-quark states two photon production mechanisms

作者: N.N.Achasov G.N.Shestakov

作者单位: Laboratory of Theoretical Physics,Sobolev Institute for Mathematics,Novosibirsk,630090,Russia

会议类型: 国际会议

会议名称: 国际φ电子到ψ电子正负电子碰撞研讨会

会议地点: 北京

会议语种:英文

页码: 807-815

在线出版日期: 2009-10-13（万方平台首次上网日期，不代表论文的发表时间）