Chiral Dynamics of the Two Λ(1405) States

Details Chiral Dynamics of the Two Λ(1405) States Chiral Dynamics of the Two Λ(1405) States

2003-03-25

arxiv.org/abs/nucl-th/0303062v1

Nucl.Phys. A725 (2003) 181-200

Physics

Nuclear Physics

Nuclear Theory

21 pages, 5 figures

Scientific paper

10.1016/S0375-9474(03)01598-7

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.

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