Spin, Parity, and Nature of theResonance
Open Access
- 2 December 2002
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 89 (25) , 252001
- https://doi.org/10.1103/physrevlett.89.252001
Abstract
Using 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 Xi resonance with J(P)=1/2(-). We identify this resonance with the Xi(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 Lambda(1670), Sigma(1620), and N(1535) states completes the octet of J(P)=1/2(-) resonances dynamically generated in this chiral unitary approach.Keywords
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