Evidence for two {lambda}(1405) resonance states

Journal Article · Sat Feb 11 00:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2176491· OSTI ID:20798078

Oset, E; Magas, V K ^[1]; Ramos, A ^[2]

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1. Departamento de Fisica Teorica, Institutos de Investigacion de Paterna -- Universidad de Valencia-CSIC, Apdo. correos 22085, 46071, Valencia (Spain)
2. Departament d'Estructura i Constituents de la Materia, Universitat de Barcelona, Diagonal 647, 08028 Barcelona (Spain)

The K-p {yields} {pi}0{pi}0{sigma}0 reaction is studied within a chiral unitary model. The distribution of {pi}0{sigma}0 states forming the {lambda}(1405) shows, in agreement with a recent experiment, a peak at 1420 MeV and a relatively narrow width of {gamma} = 38 MeV. We use these data in combination with those of the {pi}-p {yields} K0{pi}{sigma} reaction and elements of chiral unitary theory to prove that there are two {lambda}(1405) states instead of one as so far assumed.

• OSTI ID: 20798078
• Journal Information: AIP Conference Proceedings, Vol. 814, Issue 1; Conference: 11. international conference on hadron spectroscopy, Rio de Janeiro (Brazil), 21-26 Aug 2005; Other Information: DOI: 10.1063/1.2176491; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRALITY
DISTRIBUTION
ENERGY LEVELS
KAON-PROTON INTERACTIONS
LAMBDA-1405 BARYONS
MEV RANGE
PARTICLE PRODUCTION
PARTICLE WIDTHS
PIONS
RESONANCE PARTICLES
SIGMA BARYONS