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Title: Scalar {lambda}N and {lambda}{lambda} interaction in a chiral unitary approach

Abstract

We study the central part of the {lambda}N and {lambda}{lambda} potential by considering the correlated and uncorrelated two-meson exchange in addition to the {omega} exchange contribution. The correlated two-meson exchange is evaluated within a chiral unitary approach. We find that a short-range repulsion is generated by the correlated two-meson potential, which also produces an attraction in the intermediate-distance region. The uncorrelated two-meson exchange produces a sizable attraction in all cases that is counterbalanced by the {omega} exchange contribution.

Authors:
; ;  [1]
  1. Departamento de Fisica Teorica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Valencia (Spain)
Publication Date:
OSTI Identifier:
20864184
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 74; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.74.064002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BOSON-EXCHANGE MODELS; CHIRALITY; HYPERON-HYPERON INTERACTIONS; INTERACTION RANGE; LAMBDA BARYONS; NUCLEON-HYPERON INTERACTIONS; OMEGA-782 MESONS; POTENTIALS

Citation Formats

Sasaki, K., Oset, E., and Vacas, M. J. Vicente. Scalar {lambda}N and {lambda}{lambda} interaction in a chiral unitary approach. United States: N. p., 2006. Web. doi:10.1103/PHYSREVC.74.064002.
Sasaki, K., Oset, E., & Vacas, M. J. Vicente. Scalar {lambda}N and {lambda}{lambda} interaction in a chiral unitary approach. United States. doi:10.1103/PHYSREVC.74.064002.
Sasaki, K., Oset, E., and Vacas, M. J. Vicente. Fri . "Scalar {lambda}N and {lambda}{lambda} interaction in a chiral unitary approach". United States. doi:10.1103/PHYSREVC.74.064002.
@article{osti_20864184,
title = {Scalar {lambda}N and {lambda}{lambda} interaction in a chiral unitary approach},
author = {Sasaki, K. and Oset, E. and Vacas, M. J. Vicente},
abstractNote = {We study the central part of the {lambda}N and {lambda}{lambda} potential by considering the correlated and uncorrelated two-meson exchange in addition to the {omega} exchange contribution. The correlated two-meson exchange is evaluated within a chiral unitary approach. We find that a short-range repulsion is generated by the correlated two-meson potential, which also produces an attraction in the intermediate-distance region. The uncorrelated two-meson exchange produces a sizable attraction in all cases that is counterbalanced by the {omega} exchange contribution.},
doi = {10.1103/PHYSREVC.74.064002},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 74,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}
  • We make a theoretical study of the J/{psi} decays into {omega}{pi}{pi}, {phi}{pi}{pi}, {omega}KK-bar and {phi}KK-bar using the techniques of the chiral unitary approach stressing the important role of the scalar resonances dynamically generated through the final state interaction of the two pseudoscalar mesons. We also discuss the importance of new mechanisms with intermediate exchange of vector and axial-vector mesons and the role played by the OZI rule in the J/{psi}{phi}{pi}{pi} vertex, quantifying its effects. The results nicely reproduce the experimental data for the invariant mass distributions in all the channels considered.
  • The reaction {Xi}{sup {minus}}d{r_arrow}n{Lambda}{Lambda} is studied within the framework of the Faddeev equations as a possible tool to gain insight into the final state {Lambda}{Lambda} interaction. The neutron differential energy spectrum gives a final state interaction that is sensitive to both the {Lambda}{Lambda} amplitude at threshold and the coupling between the {Lambda}{Lambda} and {Xi}N channels. The latter is a result of interference between two mechanisms for the production of the final state, which suggests that this reaction could give a measure of flavor SU(3) violation in the two-baryon system. {copyright} {ital 1998} {ital The American Physical Society}
  • We study the strong and electromagnetic decay properties of scalar mesons above 1 GeV within a chiral approach. The scalar-isoscalar states are treated as mixed states of quarkonia and glueball configurations. A fit to the experimental mass and decay rates listed by the Particle Data Group is performed to extract phenomenological constraints on the nature of the scalar resonances and to the issue of the glueball decays. A comparison to other experimental results and to other theoretical approaches in the scalar meson sector is discussed.