论文标题

夸克模型中诱人的重子的分子状态解释

Molecular state interpretation of charmed baryons in the quark model

论文作者

Yan, Ye, Hu, Xiaohuang, Wu, Yuheng, Huang, Hongxia, Ping, Jialun, Yang, Youchang

论文摘要

通过观察$λ_c(2910)^+$的观察,Belle协作,$ s $ -Wave $ qqq \ bar {q} c〜(q = u〜 \ \ \ text {or} 〜d)$ pentaquark Systems具有$ i $ = 0,$ j^p $ = p $ $ \ frac {1} {2}^ - ,〜\ frac {3} {2}^ - and〜 \ frac {5} {2}^ - $在Quark Delocalization Color Secraling筛选模型(QDCSM)的框架中进行了研究。实际规模的方法用于检查有限状态和真正的共振状态。还计算了群集间距的均方根,以研究状态的结构并估计状态是否为共振状态。数值结果表明,$λ_{C}(2910)$不能解释为分子状态,而$σ_{C}(2800)$不能解释为$ nd $ j^p = 1/2^ - $。 $λ_{C}(2595)$可以解释为$ j^p = \ frac {1} {2}^ - $的分子状态,主组件为$σ_{c}π$。 $λ_{C}(2625)$可以解释为$ j^p = \ frac {3} {2}^ - $的分子状态,主组件为$σ_{c}^{*}}π$。 $λ_{C}(2940)$可能被解释为具有$ j^p = 3/2^ - $的分子状态,主组件为$ nd^{*} $。此外,预测了两个新的分子状态,一个是$ j^p = 3/2^ - $ $ $σ_{c}ρ$共振状态,质量约为3140 meV,另一个是$ j^p = \ frac {5} {5} {2} {2}^ - $ $ $ $ $ $ ol

Stimulated by the observation of $Λ_c(2910)^+$ by the Belle Collaboration, the $S$-wave $qqq\bar{q}c~(q=u~\text{or}~d)$ pentaquark systems with $I$ = 0, $J^P$ = $\frac{1}{2}^-,~\frac{3}{2}^- and~\frac{5}{2}^-$ are investigated in the framework of quark delocalization color screening model(QDCSM). The real-scaling method is utilized to check the bound states and the genuine resonance states. The root mean square of cluster spacing is also calculated to study the structure of the states and estimate if the state is resonance state or not. The numerical results show that $Λ_{c}(2910)$ cannot be interpreted as a molecular state, and $Σ_{c}(2800)$ cannot be explained as the $ND$ molecular state with $J^P=1/2^-$. $Λ_{c}(2595)$ can be interpreted as the molecular state with $J^P=\frac{1}{2}^-$ and the main component is $Σ_{c}π$. $Λ_{c}(2625)$ can be interpreted as the molecular state with $J^P=\frac{3}{2}^-$ and the main component is $Σ_{c}^{*}π$. $Λ_{c}(2940)$ is likely to be interpreted as a molecular state with $J^P=3/2^-$, and the main component is $ND^{*}$. Besides, two new molecular states are predicted, one is the $J^P=3/2^-$ $Σ_{c}ρ$ resonance state with the mass around 3140 MeV, another one is the $J^P=\frac{5}{2}^-$ $Σ_{c}^*ρ$ with the mass of 3188.3 MeV.

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