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arXiv 1009.3404hep-phhep-exnucl-th
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光子-光子碰撞强光中轻标量介子的性质

Nature of Light Scalar Mesons in Bright Light of Photon-Photon Collisions

N. N. Achasov, G. N. Shestakov

摘要:

令人惊讶的是,50年前从手征对称性自发破缺的线性西格玛模型(LSM)中产生的轻标量介子问题,已经成为非微扰量子色动力学(QCD)的中心问题,因为它已经清楚地表明LSM可能是QCD的低能实现。首先,我们简要回顾了光标量的四夸克性质的迹象。与经典的P波张量q \bar q介子通过双夸克跃迁γγ->q \bar q产生不同,在双光子碰撞中,光标量是通过四夸克跃迁产生的.从而得到了低标态四夸克性质的新证据。

英文摘要:

The surprising thing is that the light scalar meson problem, arising 50 years ago from the linear sigma model (LSM) with spontaneously broken chiral symmetry, has become central in the nonperturbative quantum chromodynamics (QCD), because 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\bar q mesons that are produced via two-quark transitions γγ->q\bar q. Thus we get new evidence of the four-quark nature of the lower scalar states.

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