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arXiv 2006.06227hep-phnucl-th
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作为$Λ\bar{K}$和$Σ\bar{K}$分子的$Ξ(1620)$的强衰变

Strong decays of the $Ξ(1620)$ as a $Λ\bar{K}$ and $Σ\bar{K}$ molecule

Yin Huang, Lisheng Geng

摘要:

在本工作中,我们研究了新观测到的$Ξ(1620)^0$的强衰变,假设它是$Λ\bar{K}$和$Σ\bar{K}$的介子-重子分子态。我们考虑了$Ξ(1620)^0$的四种可能的自旋宇称指派$J^P=1/2^{\pm}$和$3/2^{\pm}$,并借助于有效拉格朗日量计算了它通过强子环衰变到$Ξπ$的部分衰变宽度.与Belle数据相比,计算的衰变宽度有利于自旋方分配$1/2^-$,而其他自旋宇称分配不产生与分子图像中的数据一致的衰变宽度。我们发现,约$52\%$ - $68\%$的总宽度来自$\bar{K}Λ$通道,而其余的是由$\bar{K}Σ$通道提供。因此,这两个通道在解释$Ξ(1620)^0$的强衰减方面都很重要。此信息有助于进一步了解$Ξ(1620)^0$的性质。

英文摘要:

In this work, we study the strong decays of the newly observed $Ξ(1620)^0$ assuming that it is a meson-baryon molecular state of $Λ\bar{K}$ and $Σ\bar{K}$. We consider four possible spin-parity assignments $J^P=1/2^{\pm}$ and $3/2^{\pm}$ for the $Ξ(1620)^0$, and evaluate its partial decay width into $Ξπ$ via hadronic loops with the help of effective Lagrangians. In comparison with the Belle data, the calculated decay width favors the spin-party assignment $1/2^-$ while the other spin-parity assignments do not yield a decay width consistent with data in the molecule picture. We find that about $52\%$-$68\%$ of the total width comes from the $\bar{K}Λ$ channel, while the rest is provided by the $\bar{K}Σ$ channel. As a result, both channels are important in explaining the strong decay of the $Ξ(1620)^0$. This information is helpful to further understand the nature of the $Ξ(1620)^0$.

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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