Light baryonium spectrum

TL;DR

This paper uses QCD sum rules to evaluate the spectrum of light baryonium states, predicting eight possible states with specific quantum numbers and analyzing their masses and decay modes for experimental detection.

Contribution

It provides the first comprehensive QCD sum rule analysis of light baryonium states, including nonperturbative effects up to dimension 12, and predicts their masses and decay modes.

Findings

Eight possible light baryonium states identified.

Masses of some states are above dibaryon thresholds.

Decay modes are analyzed for experimental detection.

Abstract

We evaluate the light baryonium spectrum, viz. the baryon-antibaryon states, in the framework of QCD sum rules. The nonperturbative contributions up to dimension 12 are taken into account. Numerical results indicate that there might exist eight possible light baryonium states, i.e. $p$-$\bar{p}$, $\Lambda$-$\bar{\Lambda}$, $\Sigma$-$\bar{\Sigma}$, and $\Xi$-$\bar{\Xi}$ with quantum numbers of $0^{-+}$ and $1^{--}$. For the $\Lambda$-$\bar{\Lambda}$, $\Sigma$-$\bar{\Sigma}$, and $\Xi$-$\bar{\Xi}$ states, their masses are found above the corresponding dibaryon thresholds, while the masses of $p$-$\bar{p}$ states are not. The possible baryonium decay modes are analyzed, which are hopefully measurable in BESIII, BELLEII, and LHCb experiments.