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arXiv 1701.07589nucl-thhep-ph
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$\bar{K}$核准束缚态结构的少体方法

Few-body approach to structure of $\bar{K}$-nuclear quasi-bound states

Shota Ohnishi, Wataru Horiuchi, Tsubasa Hoshino, Kenta Miyahara, Tetsuo Hyodo

摘要:

用三体到七体计算方法研究了由一个反K介子$(\bar{K}=K^-,~\bar{K}^0)$和几个核子$(N=p,~n)$($\bar{K}NN$,$\bar{K}NNN$,$\bar{K}NNNN$和$\bar{K}NNNNNN$)组成的轻反K介子-核准束缚态的结构.利用基于手征SU(3)有效场论和SIDDHARTA约束的一个实际的$\bar{K}N$势,我们证明了当反K介子被注入时,这些系统的中心核子密度增加,最大增加约2倍.的$\bar{K}NNNN$系统显示出最大的中心密度,约0.74 fm的$^{-3}$,即使与现象学的$\bar{K}N$潜力,这是不高的那些建议在以前的研究与近似治疗的少体系统。我们发现$\bar{K}NNNNNN$系统基态的自旋依赖于$\bar{K}N$吸引的强度。因此,基态的量子数可以是对$\bar{K}N$相互作用的另一个约束。

英文摘要:

Structure of light antikaon-nuclear quasi-bound states, which consist of an antikaon $(\bar{K}=K^-,~\bar{K}^0)$ and a few nucleons $(N=p,~n)$ such as $\bar{K}NN$, $\bar{K}NNN$, $\bar{K}NNNN$ and $\bar{K}NNNNNN$ systems, is studied with full three- to seven-body calculations. Employing a realistic $\bar{K}N$ potential based on the chiral SU(3) effective field theory with the SIDDHARTA constraint, we show that the central nucleon densities of these systems increases when the antikaon is injected, by about factor of two at maximum. The $\bar{K}NNNN$ system shows the largest central density, about 0.74 fm$^{-3}$ even with the phenomenological $\bar{K}N$ potential, which are not as high as those suggested in previous studies with approximate treatments of the few-body systems. We find the spin of the ground state of the $\bar{K}NNNNNN$ system depends on the strength of the $\bar{K}N$ attraction. Thus, the quantum number of the ground state can be another constraint on the $\bar{K}N$ interaction.

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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