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北美退伍军人节(Veterans Day),12 日无更新
arXiv 0704.2368hep-phhep-exnucl-th
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SU_L(2)*SU_R(2)线性σ模型中的标量

Lightest scalar in the SU_L(2)*SU_R(2) linear σmodel

N. N. Achasov, G. N. Shestakov

摘要:

我们在$SU_L(2)\times SU_R(2)$线性$σ$模型的框架下考虑最轻的标量介子,记住这个模型可能是双味QCD的低能实现。我们证明了至少在$σ$共振能(虚)区,$σ$场可用四夸克分量描述,并且$σ\toγγ$衰变是四夸克跃迁.我们强调指出,在$ππ\toππ$和$γγ\toππ$振幅中,$σ$极的残基并不能给出关于$σ$介子性质的概念,而对不同过程中$σ$介子产生机制的研究进展将从根本上加深我们对其性质的理解.

英文摘要:

We consider the lightest scalar meson in the frame of the $SU_L(2)\times SU_R(2)$ linear $σ$ model, keeping in mind that this model could be the low energy realization of the two-flavour QCD. We show that the $σ$ field is described by its four-quark component at least in the $σ$ resonance energy (virtuality) region and the $σ\toγγ$ decay is the four quark transition. We emphasize that residues of the $σ$ pole in the $ππ\toππ$ and $γγ\toππ$ amplitudes do not give an idea about the $σ$ meson nature, and the progress in studying the $σ$ meson production mechanisms in different processes could essentially further us in understanding its nature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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