Effective meson-exchange potentials in the SU{sub 6} quark model for {ital NN} and {ital YN} interactions

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.54.2180· OSTI ID:389405

Fujiwara, Y; Nakamoto, C; Suzuki, Y ^[1]

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1. Department of Physics, Kyoto University, Kyoto 606-01, Japan Graduate School of Science and Technology, Niigata University, Niigata 950-21 (Japan)

We investigate characteristic properties of effective meson-exchange potentials to achieve a simultaneous description of the nucleon-nucleon ({ital NN}) and hyperon-nucleon ({ital YN}) interactions in the (3{ital q})-(3{ital q}) resonating-group formulation of the spin-flavor SU{sub 6} quark model. The quark Hamiltonian includes a phenomenological confinement potential of {ital r}{sup 2} type, the full Fermi-Breit interaction with explicit quark-mass dependence, and the central, spin-spin, and tensor components of the meson-exchange potentials generated from the scalar and pseudoscalar meson nonet exchanges. A small number of parameters are determined to fit the {ital S}- and {ital P}-wave {ital NN} phase shifts and the low-energy cross-section data for {ital YN} scattering. Satisfactory agreement with experiment is obtained, including the {ital NN} phase shifts up to {ital J}=4 partial waves, the deuteron properties, the effective-range parameters, and the total and differential cross sections of the {Lambda}{ital N} and {Sigma}{ital N} systems. In the intermediate-energy region with {ital p}{sub lab}{ge} 400{endash}500 MeV/{ital c}, some discrepancies from the one-boson exchange potentials, such as the Nijmegen and J{umlt u}lich models, are found for the {ital YN} scattering observables. In particular, the total nuclear cross sections of {Sigma}{sup +}{ital p} elastic scattering show a smooth decreasing behavior in this energy region. In {Lambda}{ital p} elastic total cross sections, the cusp structure appearing at the {Sigma}{ital N} threshold through the one-pion tensor force is influenced by the antisymmetric {ital LS}{sup ({minus})} force generated from the Fermi-Breit interaction. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 389405
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 54; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
ELASTIC SCATTERING
EXCHANGE INTERACTIONS
HAMILTONIANS
MESONS
NUCLEON-HYPERON INTERACTIONS
NUCLEON-NUCLEON INTERACTIONS
P WAVES
PARTIAL WAVES
PHASE SHIFT
POTENTIALS
QUARK MODEL
RESONATING-GROUP METHOD
SPIN
SU-6 GROUPS
TENSORS