The η decay into 3π in aysmmetric nuclear medium
The η decay into 3π in aysmmetric nuclear medium
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在不对称核介质中 η 衰变为 3π
DOI：
10.1093/ptep/ptu173
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Shuntaro Sakai and Teiji Kunihiro
中科院分区：
文献类型：
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作者：
Akinori Tanaka;Akio Tomiya;Takuya Shimotani;森田 健;Tatsuya Osaki;Shuntaro Sakai and Teiji Kunihiro
本文基于介质手征有效理论，在不同的同位旋不对称性下，研究了在核介质中-混合角和介子衰变到和3的变化。我们发现，同位旋不对称性越大，总密度越小，混合角越大。我们表明，在核介质中的衰变宽度有一个额外的密度依赖性，不能重整化成的混合角：额外的长期起源于顶点成比例的低能常数，这只在核介质中发挥作用，但不是在自由空间。结果表明，密度对衰变宽度的影响与同位旋不对称性有关，密度越大，衰变宽度越大;正常密度时，衰变宽度增加2 ~ 3倍，但由于密度的增加而略有增加，而密度对衰变宽度的影响则很小，即使在密度为10%时，也只有10%左右的增加。我们提到的手征对称性的部分恢复的核介质中的衰变宽度的意外密度效应的可能相关性。
We explore how the–mixing angle and themeson decay intoand 3are modified in the nuclear medium on the basis of the in-medium chiral effective theory with varying isospin asymmetry, wherewithand. We find that the larger the isospin asymmetryand the smaller the total density, the more enhanced the mixing angle. We show that the decay width in the nuclear medium has an additional density dependence that cannot be renormalized into that of the mixing angle: The additional term originates from the vertex proportional to a low-energy constant, which only comes into play in the nuclear medium but not in free space. It turns out that the resultant density effect on the decay widths overwhelms that coming from the isospin asymmetry, and the higher the, the more enhanced the decay widths; the width for thedecay is enhanced by a factor of two to three at the normal densitywith a minor increase due to, while that for thedecay shows only a small increase of around 10% even at. We mention the possible relevance of the partial restoration of chiral symmetry to the unexpected density effect on the decay widths in the nuclear medium.