Spin , Parity , and Nature of the 1620 Resonance
نویسندگان
چکیده
252001-1 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 resonance with JP 1=2 . We identify this resonance with the 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 1670 , 1620 , and N 1535 states completes the octet of JP 1=2 resonances dynamically generated in this chiral unitary approach.
منابع مشابه
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