Anatomy of the newly observed hidden-charm pentaquark states: P-C(4312), P-C(4440) and P-C(4457)
Anatomy of the newly observed hidden-charm pentaquark states: P-C(4312), P-C(4440) and P-C(4457)
复制标题
新观察到的隐藏魅力五夸克态的剖析：P-C(4312)、P-C(4440) 和 P-C(4457)
DOI：
10.1016/j.physletb.2019.04.053
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发表时间：
2019
影响因子：
4.4
通讯作者：
J.A.Oller
中科院分区：
文献类型：
--
作者：
Zhi-Hui Guo;J.A.Oller
在有效射程展开和共振合成关系的框架下，我们研究了LHCb合作组新近报道的隐魅五夸克候选体Pc（4312），Pc（4440）和Pc（4457）.利用Pc（4312）、Pc（4440）和Pc（4457）的质量和宽度的实验结果，计算了S波散射的有效距离和散射长度。然后我们计算了五夸克候选粒子Pc（4312）与J/Op，Oc D <$通道之间的耦合，并由此进一步估计了在Pc（4312）中找到J/Op，Oc D <$通道的概率.计算了Pc（4440）和Pc（4457）态的部分衰变宽度和复合系数.对三个Pc态也进行了类似的研究，包括Λ c D <$$>和Λ c D <$（π）通道。
We study the newly reported hidden-charm pentaquark candidates P c (4312), P c (4440) and P c (4457) from the LHCb Collaboration, in the framework of the effective-range expansion and resonance compositeness relations. The scattering lengths and effective ranges from the S-wave Σ c D¯ and Σ c D¯⁎ scattering are calculated by using the experimental results of the masses and widths of the P c (4312), P c (4440) and P c (4457). Then we calculate the couplings between the J/ψ p, Σ c D¯ channels and the pentaquark candidate P c (4312), with which we further estimate the probabilities of finding the J/ψ p and Σ c D¯ components inside P c (4312). The partial decay widths and compositeness coefficients are calculated for the P c (4440) and P c (4457) states by including the J/ψ p and Σ c D¯⁎ channels. Similar studies are also carried out for the three P c states by including the Λ c D¯⁎ and Σ c D¯(⁎) channels.