Fully heavy pentaquarks in quark models

TL;DR

This paper investigates fully heavy pentaquarks using two quark models, finding potential bound states with specific quantum numbers and masses, suggesting these states are promising targets for future experimental searches.

Contribution

It provides a systematic study of fully heavy pentaquarks within two models, highlighting the importance of channel-coupling for bound state formation and predicting specific states for experimental detection.

Findings

Identified three possible fully heavy pentaquark states with specific masses and quantum numbers.

Channel-coupling effects are crucial for the formation of bound states.

Predicted states are promising candidates for future experimental searches.

Abstract

The fully heavy pentaquarks $cccc\bar{c}$ and $bbbb\bar{b}$ are systematically investigated within the chiral quark model and quark delocalization color screening model. The results are consistent in both two moelds, and the effect of the channel-coupling is crucial for forming a bound state of the fully heavy pentaquark system. Three possible fully heavy pentaquarks are obtained, which are the $cccc\bar{c}$ state with $J^P = 1/2^-$ and the mass of $7891.9 \sim 7892.7$ MeV, the $bbbb\bar{b}$ state with $J^P=1/2^-$ and the mass of $23810.1 \sim 23813.8$ MeV, and the $bbbb\bar{b}$ state with $J^P = 3/2^-$ and the mass of $23748.2 \sim 23752.3$ MeV. All these fully heavy pentaquark states are worth searching in future experiments.