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

Abstract

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.

Authors:
;  [1]
  1. Departamento de Fisica Teorica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigacion de Paterna, Aptd. 22085, E-46071 Valencia (Spain)
Publication Date:
OSTI Identifier:
20771492
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.045213; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Kaskulov, Murat M., and Oset, E.. {lambda}(1520) and {sigma}(1385) in the nuclear medium. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.045213.
Kaskulov, Murat M., & Oset, E.. {lambda}(1520) and {sigma}(1385) in the nuclear medium. United States. doi:10.1103/PhysRevC.73.045213.
Kaskulov, Murat M., and Oset, E.. Sat . "{lambda}(1520) and {sigma}(1385) in the nuclear medium". United States. doi:10.1103/PhysRevC.73.045213.
@article{osti_20771492,
title = {{lambda}(1520) and {sigma}(1385) in the nuclear medium},
author = {Kaskulov, Murat M. and Oset, E.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.73.045213},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}