论文标题
新观察到的$ξ_c^{0} $状态的描述作为分子状态
Description of the newly observed $Ξ_c^{0}$ states as molecular states
论文作者
论文摘要
最近，三个新结构$ξ_c（2923）^0 $，$ξ（2938）^0 $和$ξ（2964）^0 $在不变的质谱中，$λ_c^{+} k^{ - } k^{ - } $观察到了LHCB协作的lhcbssopert triggers triggers triggers triggers triggers triggers triggers triggers tht他们的内部结构。在这项工作中，我们研究了新观察到的$ξ_c$的强衰减模式，假设$ξ_c$是$ \ bar {d}λ-\ bar {d}σ$分子状态。使用可能的量子数$ j^p = 1/2^{\ pm} $和$ 3/2^{\ pm} $，$ \ bar {d}λ-\ bar {d}λ-\ bar {d}σ$分子状态到$ \ bar {d}λ-\ bar {d}σ$ $ξ_c^{+}π^{ - } $通过HADRONIC LOOP在有效的Lagrangians的帮助下计算出最终状态。与LHCB观察相比，目前总衰减宽度的结果支持$ξ（2923）^0 $作为$ \ bar {d}λ-\ bar {d}σ$分子，而$ξ_c（2938）^0 $ and $ chorec（2938）^0 $和$ξ（2964）的衰减宽度不能很好。此外，计算出的部分衰减宽度具有$ s $ wave $ \ bar {d}λ-\ bar {d}σ$分子状态图片表明，允许衰减模式，$ξ_c^{+}π^{ - } $，可能具有$ $ξ_c（2923）$ $ξ_c（2923）的最大分支率。这种强衰减过程的实验测量可能是对$ξ_c（2923）$的分子解释的关键测试。
Very recently, three new structures $Ξ_c(2923)^0$, $Ξ(2938)^0$, and $Ξ(2964)^0$ at the invariant mass spectrum of $Λ_c^{+}K^{-}$ observed by the LHCb Collaboration triggers a hot discussion about their inner structure. In this work, we study the strong decay mode of the newly observed $Ξ_c$ assuming that the $Ξ_c$ is a $\bar{D}Λ-\bar{D}Σ$ molecular state. With the possible quantum numbers $J^p=1/2^{\pm}$ and $3/2^{\pm}$, the partial decay widths of the $\bar{D}Λ-\bar{D}Σ$ molecular state into the $Λ_c^{+}K^{-}$, $Σ_c^{+}K^{-}$,and $Ξ_c^{+}π^{-}$ final states through hadronic loop are calculated with the help of the effective Lagrangians. By comparison with the LHCb observation, the current results of total decay width support the $Ξ(2923)^0$ as $\bar{D}Λ-\bar{D}Σ$ molecule while the decay width of the $Ξ_c(2938)^0$ and $Ξ(2964)^0$ can not be well reproduced in the molecular state picture. In addition, the calculated partial decay widths with $S$ wave $\bar{D}Λ-\bar{D}Σ$ molecular state picture indicate that allowed decay modes, $Ξ_c^{+}π^{-}$, may have the biggest branching ratios for the $Ξ_c(2923)$. The experimental measurements for this strong decay process could be a crucial test for the molecule interpretation of the $Ξ_c(2923)$.
