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Partial Restoration of Chiral Symmetry in Nuclear Medium and Mesic Atoms

核介质和中位原子中手性对称性的部分恢复

基本信息

批准号：
16540254
负责人：
HIRENZAKI Satoru
金额：
$ 2.24万
依托单位：
Nara Women's University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

We have investigated the partial restoration of Chiral Symmtery in Nuclear Medium by considering the structure and formation of various mesic atoms and mesic nuclei like pionic atoms, kaonic atoms, kaonic nuclei, eta mesic nuclei, and eta(958) mesic nuclei. We have considered several microscopic theories to study the meson properties in nuclear medium to evaluate the binding energies and decay widths of mesic states in nuclei. We have also considered seriously the experimental feasibilities to observe these staes in realistic conditions which can be performed in the present facilities like Spring8, J-PARC, and RIBF.Ours main results are followings,(i) Structure and Formation of kaonic atoms are studied theoretically using the chiral unitary optical potential and the Green function method in addition to the effective number approach. We have concluded that the naive interpretation of the observed (K, N) spectrum as the indications of the kaonic nuclear states is very dangerous and must be chenked seriously.(ii) Eta and Eta (958) mesic nuclei is studied using the effective chiral NJL laglangian. We calculated the mass shift of the eta and eta(958) in nucleus and predicted the binding energies and widths of these states. One of the most interesting point of these staes is that the very heavy eta (958) mass is believed to be closely related to the U(1) quantum anomaly. We can expect to have the first experimental results of the medium effects on the quantumu anomaly. The theoretical predictions of the formation rate of these states are performed.

本文通过研究介子原子、介子原子、介子核、介子核、介子核、介子核、介子核等各种介子原子和介子核的结构和形成，研究了核介质中手性对称性的部分恢复。我们考虑了几种微观理论来研究核介质中的介子性质，以评估原子核中介子态的结合能和衰变宽度。我们还认真考虑了在现实条件下观察这些状态的实验可行性，这些实验可以在Spring8， J-PARC和RIBF等现有设施中进行。主要研究结果如下：(1)利用手性酉光势和格林函数法，结合有效数法，从理论上研究了kaonic原子的结构和形成。我们得出的结论是，将观测到的（K， N）光谱作为kaonic核态的指示的天真解释是非常危险的，必须严肃对待。（ii）利用有效手性NJL拉格朗日量研究了Eta和Eta（958）介核。我们计算了原子核中eta和eta（958）的质量位移，并预测了这些态的结合能和宽度。这些状态中最有趣的一点是，非常重的eta（958）质量被认为与U(1)量子异常密切相关。我们可以期待得到第一个关于介质对量子异常影响的实验结果。对这些态的形成速率进行了理论预测。