Abstract
The behaviour of the p p→Λ Λ reaction cross section near the Λ Λ threshold is described within a hermitian coupled-channels approach. The observed structure is shown to be caused by a narrow Λ Λ subthreshold state of quasinuclear nature. This resonance with quantum numbers J PC =1 −− is produced in the 3SD 1 partial wave and has a width of a few MeV. The physical reasons for the smallness of its width are explained. Other experimental possibilities to find this resonance are proposed.
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