3 years ago

Revisiting hidden-charm pentaquarks from QCD sum rules.

Hua-Xing Chen, Jia-Bing Xiang, Xiao-Bo Li, Shi-Lin Zhu, Xing-Qun Yao, Wei Chen

We revisit the hidden-charm pentaquark states $P_c(4380)$ and $P_c(4450)$ using the method of QCD sum rules by requiring the pole contribution to be larger than or around 30\% to better insure the one-pole parametrization to be valid. We find two mixing currents and our results suggest that the $P_c(4380)$ and $P_c(4450)$ can be identified as hidden-charm pentaquark states having $J^P=3/2^-$ and $5/2^+$, respectively, while there still exist other possible spin-parity assignments, such as $J^P=3/2^+$ and $J^P=5/2^-$, which needs to be clarified in further theoretical and experimental studies.

Publisher URL: http://arxiv.org/abs/1711.01545

DOI: arXiv:1711.01545v1

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