Abstract
Very recently, the LHCb Collaboration reported a fully charmed tetraquark state $X(6900)$ in the invariant mass spectrum of $J/\psi$ pairs. If one $J/\psi$ meson is replaced with a fully charmed baryon, we obtain a fully charmed pentaquark candidate. In this work, we perform a systematic study on the mass spectra of the S-wave fully heavy pentaquark $QQQQ\bar{Q}$ in the framework of the chromomagnetic interaction model. Based on our results in two different schemes, we further investigate the decay behaviors for them. We hope that our study will be helpful in searching for such types of exotic pentaquark states in experiments in the future.
Highlights
At the birth of the quark model [1,2,3], Gell-Mann and Zweig indicated that hadronic states with the qqqq ̄ and qqqqqquark configurations should exist in nature
We systematically study the S-wave QQQQQpentaquark system within the framework of the chromomagnetic interaction (CMI) model to calculate the mass spectra and the relative partial decay widths, and find a possible stable pentaquark state
As for the expressions of CMI matrices for the ccccb, bbbbc, bbbbb, cccbb, bbbcc, bbbcb, and ccbbbpentaquark subsystems, we can obtain them from the expressions of the ccccc, cccbc, and ccbbcpentaquark subsystems according to their similar symmetry properties
Summary
At the birth of the quark model [1,2,3], Gell-Mann and Zweig indicated that hadronic states with the qqqq ̄ and qqqqqquark configurations should exist in nature. After the LHCb Collaboration reported their results, the strong decay properties of S- and P-wave tetraquark states were further studied in Ref. We systematically study the S-wave QQQQQpentaquark system within the framework of the CMI model to calculate the mass spectra and the relative partial decay widths, and find a possible stable pentaquark state.
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