Chiral Dynamics of the Two \Lambda(1405) States
Nuclear Theory
2009-11-10 v1 High Energy Physics - Experiment
High Energy Physics - Phenomenology
Nuclear Experiment
Abstract
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.
Cite
@article{arxiv.nucl-th/0303062,
title = {Chiral Dynamics of the Two \Lambda(1405) States},
author = {D. Jido and J. A. Oller and E. Oset and A. Ramos and U. -G. Meißner},
journal= {arXiv preprint arXiv:nucl-th/0303062},
year = {2009}
}
Comments
21 pages, 5 figures