Study of Hidden-Charm and Hidden-Bottom Pentaquark Resonances in the Quark Model

Inspired by the LHCb observation of hidden-charm pentaquarks, i.e., P-c(4312), P-c(4440), and P-c(4457) in the J/?p invariant mass spectrum, a calculation of the J/?p scattering cross-section was performed using the quark-delocalization color screening model. The results show that P-c(4312) can be identified as a hidden-charm molecular state ScD with J(P) = 1/2(-). The two-peak structure can be reproduced around 4450 MeV, which corresponds to P-c(4440) and P-c(4457). They are the resonances molecular states ScD* of J(P) = 1/2(-) and J(P) = 3/2(-). Moreover, the S-c*D* of both J(P) = 1/2(-) and J(P) = 3/2(-) are possible molecular pentaquarks. Moreover, in the same theoretical frame, the calculation is extended to the P-c-like molecular pentaquarks, denoted as P-b. Several hidden-bottom pentaquarks with masses above 11 GeV and narrow widths were obtained. All of these heavy pentaquarks are worth exploring in future experiments.

Automated summary

Inspired by the observation of hidden-charm pentaquarks, a calculation of the J/ψp scattering cross-section was performed using a specific model. The results indicate the identification of certain pentaquarks as hidden-charm molecular states. Moreover, the calculation was extended to explore hidden-bottom pentaquarks, revealing several heavy pentaquarks for further investigation in future experiments.