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arXiv 0706.0258nucl-th
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介质π介子与手征对称性的部分恢复:一个与模型无关的分析

In-medium Pions and Partial Restoration of Chiral Symmetry: a model-independent analysis

D. Jido, T. Hatsuda, T. Kunihiro

摘要:

利用QCD中的算符关系,我们导出了一个新的与模型无关的关于介质中夸克凝聚 <bar-q q>* 与核介质中π介子衰变常数F* t和波函数重整化常数Z* 的关系式.由等标量π-核子散射数据计算低密度下的Z*,得出在深束缚π原子中观察到的s波等矢量π-核相互作用的排斥增强直接意味着介质中夸克凝聚的减少.要得出这个结论,不需要知道介质中的π介子质量。

英文摘要:

Exploiting operator relations in QCD, we derive a novel and model-independent formula relating the in-medium quark condensate <bar-q q>* to the decay constant F*_t and the wave function renormalization constant Z* of the pion in the nuclear medium. Evaluating Z* at low density from the iso-scalar pion-nucleon scattering data, it is concluded that the enhanced repulsion of the s-wave isovector pion-nucleusinteraction observed in the deeply bound pionic atoms implies directly the reduction of the in-medium quark condensate. The knowlege of the in-medium pion mass is not necessary to reach this conclusion.

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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