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.
Highlights
The establishment of quark model (QM) in 1960s [1,2] led to a renaissance in the exploration of micro worlds
The possible baryonium decay modes are analyzed, which are hopefully measurable in BESIII, BELLEII, and LHCb experiments
A bunch of charmoniumlike/bottomoniumlike states XYZ and pentaquark states Pc are observed in experiments; this situation is similar to the phase of particle zoo witnessed in the last century
Summary
The establishment of quark model (QM) in 1960s [1,2] led to a renaissance in the exploration of micro worlds. Theoretical investigations on light baryonium were made through various techniques, including flux tube model [33,34], one-bosonexchange potential (OBEP) model [35], Bethe-Salpeter approach [36,37], and QCD sum rules (QCDSR) [38]. Of those techniques, the model with the independent Shifman, Vainshtein, and Zakharov (SVZ) sum rule technique [39] has some peculiar advantages in exploring hadron properties involving nonperturbative QCD.
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