Three-body hadronic structure of low-lying 1/2+ Σ and Λ resonances⋆
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We discuss the dynamical generation of some low-lying 1/2+ Σ 's and Λ 's in two-meson one-baryon systems. These systems have been constructed by adding a pion in the S -wave to the ¯N pair and its coupled channels, where the 1/2- Λ(1405) -resonance gets dynamically generated. We solve Faddeev equations in the coupled-channel approach to calculate the T -matrix for these systems as a function of the total energy and the invariant mass of one of the meson-baryon pairs. This squared T -matrix shows peaks at the energies very close to the masses of the strangeness -1 , 1/2+ resonances listed in the particle data book.
PACS.21.45.-v Few-body systems 14.20.Jn Hyperons
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