Role of five-quark components in radiative and strong decays of the LAMBDA(1405) resonance

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.045203· OSTI ID:21388968

An, C S; Saghai, B ^[1]; Yuan, S G; He, Jun ^[2]

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1. Institut de Recherche sur les lois Fondamentales de l'Univers, DSM/Irfu, CEA/Saclay, F-91191 Gif-sur-Yvette (France)
2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)

Within an extended chiral constituent quark model, the three- and five-quark structure of the S{sub 01} resonance LAMBDA(1405) is investigated. Helicity amplitudes for electromagnetic decays [LAMBDA(1405)->LAMBDA(1116)gamma, SIGMA(1194)gamma] and transition amplitudes for strong decays [LAMBDA(1405)->SIGMA(1194)pi, K{sup -}p] are derived, as well as the relevant decay widths. The experimental value for the strong decay width, GAMMA{sub LAMBDA}{sub (1405)-}>{sub (SIGMA{sub pi})}{sup o} =50+-2 MeV, is well reproduced with about 50% of a five-quark admixture in the LAMBDA(1405). Important effects owing to the configuration mixing among LAMBDA{sub 1}{sup 2}P{sub A}, LAMBDA{sub 8}{sup 2}P{sub M}, and LAMBDA{sub 8}{sup 4}P{sub M} are found. In addition, transitions between the three- and the five-quark components in the baryons turn out to be significant in both radiative and strong decays of the LAMBDA(1405) resonance.

• OSTI ID: 21388968
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 4; Other Information: DOI: 10.1103/PhysRevC.81.045203; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRALITY
CONFIGURATION MIXING
HELICITY
KAONS MINUS
LAMBDA PARTICLES
LAMBDA-1405 BARYONS
MEV RANGE
PARTICLE DECAY
QUARK MODEL
QUARKS
RESONANCE
TRANSITION AMPLITUDES
AMPLITUDES
BARYONS
BOSONS
COMPOSITE MODELS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
HYPERONS
INTERACTIONS
KAONS
LAMBDA BARYONS
MATHEMATICAL MODELS
MESONS
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES