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

## TL;DR

This study uses the color-magnetic interaction framework to analyze hidden-charm pentaquarks, their potential partners, and their decay properties, providing insights into their mass spectrum and decay widths in relation to LHCb observations.

## Contribution

It systematically investigates the mass splittings and decay characteristics of hidden-charm pentaquarks and predicts the existence of their hidden-bottom and $B_c$-like partners, expanding understanding of exotic hadrons.

## Key findings

- LHCb $P_c$ states align with predicted pentaquark mass regions.
- Most pentaquarks are broad due to allowed open-charm decays.
- Certain $J^P=\frac52^-$ states are narrower due to decay suppression.

## 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.