{lambda}(1520) and {sigma}(1385) in the nuclear medium

Journal Article · Sat Apr 15 04:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.73.045213· OSTI ID:20771492

Kaskulov, Murat M; Oset, E ^[1]

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1. Departamento de Fisica Teorica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigacion de Paterna, Aptd. 22085, E-46071 Valencia (Spain)

Recent studies of the {lambda}(1520) resonance within chiral unitary theory with coupled channels find the resonance as a dynamically generated state from the interaction of the decuplet of baryons and the octet of mesons, essentially a quasibound state of {pi}{sigma}{sup *}(1385) in this case, although the coupling of the {lambda}(1520) to the KN and {pi}{sigma} makes this picture only approximate. The {pi}{sigma}{sup *}(1385) decay channel of the {lambda}(1520) is forbidden in free space for the nominal mass of the {sigma}{sup *}(1385), but the coupling of the {pi} to ph components in the nuclear medium opens new decay channels of the {lambda}(1520) in the nucleus and produces a much larger width. Together with medium modifications of the KN and {pi}{sigma} decay channels, the final width of the {lambda}(1520) at nuclear matter density is more than five times bigger than the free one. We perform the calculations by dressing simultaneously the {lambda}(1520) and the {sigma}{sup *}(1385) resonances, finding moderate changes in the mass but substantial ones in the width of both resonances.

• OSTI ID: 20771492
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 73; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
CHIRALITY
COUPLED CHANNEL THEORY
COUPLING
HADRONIC PARTICLE DECAY
HYPERNUCLEI
KAONS
LAMBDA-1520 BARYONS
NUCLEAR MATTER
PIONS
QUASIBOUND STATE
REST MASS
SIGMA-1385 BARYONS