Ramos Gómez, ÀngelsOset Baguena, EulogioBennhold, Cornelius2010-06-092010-06-0920020031-9007https://hdl.handle.net/2445/12810Using a unitary extension of chiral perturbation theory with a lowest-order s -wave SU(3) chiral Lagrangian we study low-energy meson-baryon scattering in the strangeness S = − 2 sector. A scattering-matrix pole is found around 1605 MeV which corresponds to an s -wave Ξ resonance with J P = 1 / 2 − . We identify this resonance with the Ξ ( 1620 ) state, quoted by the Particle Data Group with I = 1 / 2 but with unknown spin and parity. The addition of the S = − 2 state to the recently computed Λ ( 1670 ) , Σ ( 1620 ) , and N ( 1535 ) states completes the octet of J P = 1 / 2 − resonances dynamically generated in this chiral unitary approach.4 p.application/pdfeng(c) American Physical Society, 2002Partícules (Matèria)Spin (Física nuclear)ParticlesNuclear spininfo:eu-repo/semantics/article505051info:eu-repo/semantics/openAccess