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arXiv 1606.06148hep-ph
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组分夸克模型中的LHCb五夸克态

LHCb pentaquarks in constituent quark models

P. G. Ortega, D. R. Entem, F. Fernández

摘要:

最近在LHCb发现的$P_c(4380)^+$和$P_c(4450)^+$态的质量分别接近于$\bar DΣ_c^*$和$\bar D^*Σ_c$阈值,这表明它们可能具有重要的介子-重子分子成分。我们分析这些国家的组成夸克模型已被应用到广泛的强子观测量的框架,作为模型参数,因此,完全约束。研究了$P_c(4380)^+$和$P_c(4450)^+$作为由粲重子和开粲介子组成的分子态。在$\bar DΣ_c^*$和$\bar D^*Σ_c$通道中发现了几个具有适当结合能的束缚态。我们讨论了这些国家可能的分配从他们的衰变宽度。此外,预测了与$\bar DΣ_c$和$\bar D^* Σ_c^*$阈值相关联的另外两个状态。

英文摘要:

The recently discovered $P_c(4380)^+$ and $P_c(4450)^+$ states at LHCb have masses close to the $\bar DΣ_c^*$ and $\bar D^*Σ_c$ thresholds, respectively, which suggest that they may have significant meson-baryon molecular components. We analyze these states in the framework of a constituent quark model which has been applied to a wide range of hadronic observables, being the model parameters, therefore, completely constrained. The $P_c(4380)^+$ and $P_c(4450)^+$ are studied as molecular states composed by charmed baryons and open charm mesons. Several bound states with the proper binding energy are found in the $\bar DΣ_c^*$ and $\bar D^*Σ_c$ channels. We discuss the possible assignments of these states from their decay widths. Moreover, two more states are predicted, associated with the $\bar DΣ_c$ and $\bar D^* Σ_c^*$ thresholds.

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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