Hidden-bottom and -charm hexaquark states in QCD sum rules

TL;DR

This paper uses QCD sum rules to predict the existence and masses of hidden-bottom and -charm hexaquark states, suggesting potential baryonium states observable at major particle physics experiments.

Contribution

It provides the first QCD sum rule analysis of hidden-bottom and -charm hexaquark states with detailed mass predictions for various quantum numbers.

Findings

Predicted baryonium states in b-quark sector at ~11.8 GeV.

Hidden-charm baryonium states at ~5.2 GeV.

States are above dibaryon thresholds, enabling experimental detection.

Abstract

In this paper, we investigate the spectra of the prospective hidden-bottom and -charm hexaquark states with quantum numbers $J^{PC }= 0^{++}$, $0^{-+}$, $1^{++}$ and $1^{--}$ in the framework of QCD sum rules. By constructing appropriate interpreting currents, the QCD sum rules analyses are performed up to dimension 12 of the condensates. Results indicate that there exist two possible baryonium states in $b$-quark sector with masses $11.84 \pm 0.22$ GeV and $11.72 \pm 0.26$ GeV for $0^{++}$ and $1^{--}$, respectively. The corresponding hidden-charm partners are found lying respectively at $5.19 \pm 0.24$ GeV and $4.78 \pm 0.23$ GeV. Note that these baryonium states are all above the dibaryon thresholds, which enables their dominant decay modes could be measured at BESIII, BELLEII, and LHCb detectors.