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arXiv · 1701.03873

Hidden-charm pentaquarks and their hidden-bottom and $B_c$-like partner states

Jing Wu·Yan-Rui Liu·Kan Chen·Xiang Liu·Shi-Lin Zhu
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Abstract

In the framework of the color-magnetic interaction, we have systematically studied the mass splittings of the possible hidden-charm pentaquarks $qqqc\bar{c}$ ($q=u,d,s$) where the three light quarks are in a color-octet state. We find that i) the LHCb $P_c$ states fall in the mass region of the studied system; ii) most pentaquarks should be broad states since their $S$-wave open-charm decays are allowed while the lowest state is the $J^P=\frac12^-$ $\Lambda$-like pentaquark with probably the suppressed $\eta_c\Lambda$ decay mode only; and iii) the $J^P=\frac52^-$ states do not decay through $S$-wave and their widths are not so broad. The masses and widths of the two LHCb $P_c$ baryons are compatible with such pentaquark states. We also explore the hidden-bottom and $B_c$-like partners of the hidden-charm states and find the possible existence of the pentaquarks which are lower than the relevant hadronic molecules.

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Jing Wu, Yan-Rui Liu, Kan Chen, Xiang Liu, Shi-Lin Zhu. 2017-01-14. Hidden-charm pentaquarks and their hidden-bottom and $B_c$-like partner states. https://doi.org/10.1103/physrevd.95.034002

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