The recently discovered P c ( 4380 ) + and P c ( 4450 ) + states at LHCb have masses close to the D ˉ Σ c ? and D ˉ ? 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 D ˉ Σ c ? and D ˉ ? Σ c channels. We discuss the possible assignments of these states from their decay widths. Moreover, two more states are predicted, associated with the D ˉ Σ c and D ˉ ? Σ c ? thresholds.
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机译：在LHCb处最近发现的P c（4380）+和P c（4450）+态的质量接近DΣΣc？和Dˉ？ Σc阈值分别表明它们可能具有重要的介子-重子分子成分。我们在构成夸克模型的框架内分析了这些状态，该夸克模型已被广泛应用于强子观测值，因此作为模型参数受到了完全约束。研究了P c（4380）+和P c（4450）+作为有魅力的重子和开放魅力介子组成的分子态。在DˉΣc？中找到具有适当结合能的几个结合态。和Dˉ？ Σc通道。我们从它们的衰减宽度讨论这些状态的可能分配。此外，还预测了另外两个与D states c和D and c相关的状态。 Σc？阈值。
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