6533b873fe1ef96bd12d5930
RESEARCH PRODUCT
Chiral Dynamics of the two Lambda(1405) States
D. JidoJ. A. OllerE. OsetA. RamosU. -G. Meissnersubject
Nuclear TheoryLambda(1405)High Energy Physics::Latticeinelastic scattering [meson baryon]Nuclear TheoryHigh Energy Physics::PhenomenologyFOS: Physical sciencesFísicaSU(3) [symmetry]singlet [baryon]symmetry breakingcoupled channelHigh Energy Physics - ExperimentNuclear Theory (nucl-th)High Energy Physics - Phenomenologyddc:530elastic scattering [meson baryon]chiral [effective Lagrangian]numerical calculationsNuclear Experimentoctet [baryon]analytic properties [scattering amplitude]description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-06-15 |