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Title: Spin, parity and nature of the Xi(1620) resonance
Author: Ramos Gómez, Àngels
Oset Baguena, Eulogio
Bennhold, Cornelius
Keywords: Partícules (Matèria)
Spin (Física nuclear)
Nuclear spin
Issue Date: 2002
Publisher: American Physical Society
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 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.
Note: Reproducció digital del document proporcionada per PROLA i
It is part of: Physical Review Letters, 2002, vol. 89, núm. 25, p. 252001-1-252001-4
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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