论文标题
$λ\ bar {k} $和$σ\ bar {k} $分子的$ξ（1620）$的强衰减为$λ\ bar {k} $
Strong decays of the $Ξ(1620)$ as a $Λ\bar{K}$ and $Σ\bar{K}$ molecule
论文作者
论文摘要
在这项工作中，我们研究了新观察到的$ξ（1620）^0 $的强衰变，假设它是$λ\ bar {k} $和$σ\ bar {k} $的梅森 - 巴里昂分子状态。我们考虑了四个可能的自旋 - 超级分配$ j^p = 1/2^{\ pm} $和$ 3/2^{\ pm} $的$ξ（1620）^0 $，并在有效的lagrangians的帮助下通过HADRONIC LOOPS评估其部分衰减宽度。与Belle数据相比，计算出的衰减宽度有利于旋转派对分配$ 1/2^ - $，而其他自旋 - 超元分配没有产生与分子图片中数据一致的衰减宽度。我们发现，总宽度的$ 52 \％$ - $ 68 \％$来自$ \ bar {k}λ$通道，而其余的则由$ \ bar {k}σ$ channel提供。结果，两个通道对于解释$ξ（1620）^0 $的强衰减都很重要。此信息有助于进一步了解$ξ（1620）^0 $的性质。
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 $Ξ(1620)^0$.
