Light baryonium spectrum

Abstract

We evaluate the light baryonium sepectrum, viz. the baryon-antibaryon states, in the framework of QCD sum rules. The non-perturbative contributions up to dimension 12 are taken into account.Numerical results indicate that there might exist 8 possible light baryonium states, i.e. p-p, Λ-Λ, Σ-Σ, and Ξ-Ξ with quantum numbers of 0 −+ and 1 −− . For the Λ-Λ, Σ-Σ, and Ξ-Ξ states, their masses are found above the corresponding dibaryon thresholds, while the masses of p-p states are not. The possible baryonium decay modes are analyzed, which are hopefully measurable in BESIII, BELLEII, and LHCb experiments.

Hyperon semileptonic decays in QCD sum rules

“…In our numerical calculations, related parameters of baryon octet are shown in table 2 and other inputs are adopted as follows [4,42,[50][51][52][53][54][55][56][57][58][59][60][61]: ⟨qq⟩ = −(0.24 ± 0.01) 3 GeV 3 , ⟨ss⟩ = (0.8 ± 0.1)⟨qq⟩,…”