Relativistic. sigma. -. omega. mean-field theory for hyperons from a quark model

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.1181· OSTI ID:5244133

Cohen, J; Weber, H J ^[1]

---

1. Institute for Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia (USA)

We suggest a phenomenological description of hypernuclear {sigma}-{omega} Dirac mean-field theory, where the meson-baryon vertices are based on the quark model with relativistic corrections. While the model is shown to be in agreement with the {sigma}-{omega} model for regular nuclei, large tensor {omega}{ital YY} couplings are derived for {omega}-hyperon vertices. This coupling, which is negligible for nucleons, is capable of resolving the problem of the small spin-orbit interaction in {Lambda} hypernuclei within the Dirac approach, as was recently shown independently by Jennings. Our model explains the available data. It can also be the basis for more systematic theoretical studies. Predictions are thus presented for {Sigma} and {Xi} hypernuclei. Further improvements of the model are discussed.

• OSTI ID: 5244133
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

645400 -- High Energy Physics-- Field Theory
653001* -- Nuclear Theory-- Nuclear Structure
Moments
Spin
& Models
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
COMPOSITE MODELS
COUPLING
DIFFERENTIAL EQUATIONS
DIRAC EQUATION
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FIELD THEORIES
FUNCTIONS
GENERAL RELATIVITY THEORY
HADRONS
HYPERNUCLEI
HYPERONS
INTERMEDIATE COUPLING
L-S COUPLING
LAGRANGIAN FUNCTION
LAMBDA BARYONS
MATHEMATICAL MODELS
MEAN-FIELD THEORY
NUCLEAR FRAGMENTS
NUCLEI
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE MODELS
QUARK MODEL
RELATIVITY THEORY
SCALAR FIELDS
SIGMA BARYONS
STRANGE PARTICLES
WAVE EQUATIONS
XI BARYONS