光标量研究的经验教训
Study of Light Scalars, the learned Lessons
摘要：
注意的是支付的生产机制，揭示其性质的轻标量。在线性西格玛模型中，揭示了σ（600）介子的手征屏蔽，并表明σ场可用它的四夸克分量描述。考虑σ（600）和f_0（980）介子、σ（600）的手征屏蔽、σ（600）-f_0（980）混合以及手征展开和Roy方程的结果，构造了ππ散射振幅。实验数据符合σ（600）和f_0（980）的四夸克性质。结果表明，$ϕ$辐射衰变为轻标量介子的K介子环机制是四夸克跃迁，并得到了实验的证实，指出了轻标量的四夸克性质。与经典的P波张量q \bar q介子通过双夸克跃迁γγ \to q \bar q产生不同，在双光子碰撞中通过四夸克跃迁产生光标量介子，这也表明了光标量介子的四夸克性质.制定了进一步调查的方案。
英文摘要：
Attention is paid to the production mechanisms of the light scalars that reveal their nature. In the linear sigma model it is revealed the chiral shielding of the σ(600) meson and shown that the σfield is described by its four-quark component. The ππscattering amplitude is constructed taking into account the σ(600) and f_0(980) mesons, the chiral shielding of σ(600), the σ(600)-f_0(980) mixing, and results, obtained on the base of the chiral expansion and the Roy equations. The data agree with the four-quark nature of σ(600) and f_0(980). It is shown, that the kaon loop mechanism of the $ϕ$ radiative decays into the light scalar mesons, which is ratified by experiment, is the four-quark transition and points to the four-quark nature of the light scalars. It is shown also, that the light scalars are produced in the two photon collisions via four-quark transitions in contrast to the classic P wave tensor q\bar q mesons, which are produced via two-quark transitions γγ\to q\bar q, that points to the four-quark nature of the light scalar mesons, too. A programme of further investigations is laid down.
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