Chiral dynamics of the two Lambda(1405) states

By D. Jido, J. A. Oller, E. Oset, À. Ramos, U. Meissner. 2003

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Using a chiral unitary approach for the meson--baryon interactions, we show that two octets of J^{\pi}=1/2^- baryon states, which are degenerate in the limit of exact SU(3) symmetry, and a singlet are generated dynamically. The SU(3) breaking produces the splitting of the two octets, resulting in the case of strangeness S=-1 in two poles of the scattering matrix close to the nominal \Lambda(1405) resonance. These poles are combinations of the singlet state and the octets. We show how actual experiments see just one effective resonance shape, but with properties which change from one reaction to another.

Subfields: Nuclear and High Energy Physics, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/3238a7ec2be77bdb0d97c15ac89bdda631efcfc5

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In Nuclear and High Energy Physics

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Baryons as relativistic three-quark bound states (2016, background): “annel effects, see [37] for a review. In the coupled channel chiral unitary approach there is even evidence for two states sitting close together, mostly appearing as a single resonance in experiment [38]. Other states in the negative parity sector, the (1670) and the (1800) , may be predominantly ﬂ”