Fully heavy pentaquark states from QCD sum rules

TL;DR

This paper predicts the masses of fully heavy pentaquark states using QCD sum rules, providing specific mass estimates for $ccccar{c}$ and $bbbbar{b}$ configurations, advancing understanding of exotic heavy hadrons.

Contribution

It introduces a systematic QCD sum rule analysis for fully heavy pentaquark states with multiple interpolating current configurations, offering new mass predictions.

Findings

Masses for $ccccar{c}$ states around 7.76-7.81 GeV.

Masses for $bbbbar{b}$ states around 22.27-22.37 GeV.

Predicted mass values with uncertainties for different configurations.

Abstract

In this work, we systematically investigate the mass spectra of fully heavy pentaquark states $QQQQ\bar{Q}$ within the framework of QCD sum rules. Employing three configurations of interpolating currents, we obtain the following mass predictions: for the $cccc\bar{c}$ states, the masses are determined to be $7.79^{+0.18}_{-0.17}$ GeV, $7.76^{+0.23}_{-0.18}$ Gev, $7.81^{+0.17}_{-0.18}$ GeV; while for the $bbbb\bar{b}$ states, the corresponding masses are calculated as $22.35^{+0.19}_{-0.19}$ GeV, $22.27^{+0.22}_{-0.22}$ GeV, $22.37^{+0.18}_{-0.20}$ GeV, respectively.