(I, JP) = (1, 1/2+)ΣNN Quasibound State

Abstract

JLab has recently found indications of the possible existence of a ΣNN resonance at (3.14±0.84)−i(2.28±1.2) MeV. In the past, using models that exploit symmetries between the two-baryon sector with and without strangeness, hyperon–nucleon interactions that reproduce the experimental data of the strangeness −1 sector have been derived. We make use of these interactions to review the existing Faddeev studies of the ΛNN−ΣNN system that show theoretical evidence of a (I,JP)=(1,1/2+)ΣNN quasibound state near the threshold. The calculated position of the pole is at 2.92−i2.17 MeV, which is in reasonable agreement with the experimental findings.