We present an analysis of the newly observed pentaquark to shed light on its quantum numbers. To do that, the QCD sum rules approach is used. The measured mass of this particle is close to the threshold and has a small width, which supports the possibility of its being a molecular state. We consider an interpolating current in a molecular form and analyze both the positive and negative parity states with spin- . We also consider the bottom counterpart of the state with similar molecular form. Our mass result for the charm pentaquark state supports that the quantum numbers of the observed state are consistent with .

中文翻译：

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P c(4312) 五夸克及其底部伙伴的性质

我们对新观察到的五夸克进行了分析，以阐明其量子数。为此，使用了 QCD 和规则方法。该粒子的测量质量接近阈值且宽度较小，这支持了其为分子状态的可能性。我们考虑分子形式的内插电流，并用自旋分析正和负宇称状态。我们还考虑具有相似分子形式的状态的底部对应物。我们对魅力五夸克状态的质量结果支持观察到的状态的量子数与 一致。