SU6 Quark Model Research Articles

A realistic baryon-baryon interaction in the SU6 quark model and its applications to few-baryon systems

The recent quark-model baryon-baryon interaction by the Kyoto-Niigata group is applied to the three-nucleon, 2αΓ and 2Γα systems, in which a new three-cluster Faddeev formalism, using the 2-cluster resonating-group method (RGM) kernel, is developed for the exact treatment of the Pauli forbidden states between clusters.

Three-nucleon bound state in the SU6 quark model for the baryon-baryon interaction

Three-nucleon bound state in the SU6 quark model for the baryon-baryon interaction

QUARK-MODEL INTERACTIONS FOR THE COMPLETE BARYON OCTET AND THEIR APPLICATIONS TO FEW-BARYON SYSTEMS

Baryon-baryon interactions of the complete baryon octet (B8) are investigated in a unified framework of the (3q)-(3q) resonating-group method, which employs the spin-flavor SU6 quark-model wave functions. Model parameters are determined to reproduce properties of the nucleon-nucleon system and the low-energy cross section data for the hyperon-nucleon interaction. The characteristic features of the B8B8 interactions predicted by the most recent model fss2 are reviewed. The nucleon-nucleon sector of this SU6 quark model is applied to calculate properties of the three-nucleon bound state. The calculated binding energy for 3H is the closest to the experiment among many results obtained by detailed Faddeev calculations employing modern realistic nucleon-nucleon potentials.

ΞN interaction in the SU6 quark model

ΞN interaction in the SU6 quark model

Experimental H-particle searches

We investigate the dependence of the H-particle mass on the effective meson-exchange potentials by adopting the recent SU6 quark model developed for a unified description of the N N and Y N interactions. The results are sensitive to the magnitude of the attraction of the ΞN interaction and the strength of the ΛΛ - ΞN channel coupling. The H-particle may be bound when the ΛΛ - ΞN coupling effect is strong, which depends on the strength of the strange-meson exchange potentials and the flavor-symmetry breaking generated from the mass difference between ud and s quarks.

Lippmann-Schwinger Resonating-Group Formalism for NN and YN Interactions in an SU6 Quark Model

We formulate a Lippmann-Schwinger-type resonating-group equation to calculate invariant amplitudes of the quark-model baryon-baryon interaction. When applied to our recent SU6 quark model for the nucleon-nucleon and hyperon-nucleon interactions, this technique yields very accurate phase-shift parameters for all partial waves up to the energies of several GeV. The technique also has a merit of a straightforward extension to the G-matrix equation. A new analytic method is proposed to calculate the quark-exchange Born kernel for the momentum-dependent two-body interaction. The partial-wave decomposition in the momentum representation is carried out numerically. The invariant amplitudes are then used to calculate single-nucleon potentials in normal nuclear matter for high incident momenta q_1 > 3 (1/fm), in which the so-called t^eff-rho prescription is found to be a good approximation to the single-particle potentials directly calculated in the lowest-order Brueckner theory.

Inelastic Capture Ratio at Rest and Low-Energy Cross Sections of -p Scattering in the SU6 Quark Model

The inelastic capture ratio at rest, TR, and low-energy total cross sections of E-p scat­ tering are examined in the recent SU6 quark model developed for a unified description of the N Nand Y N interactions. The effect of the small mass difference between E-p and EOn channels is treated approximately and the Coulomb attraction in the E-p channel is properly incorporated in the particle basis. The model FSS predicts TR = 0.461, which is very close to the experimental value. The low-energy cross sections for the charge exchange reaction E-p -+ EOn are improved, although those for E-p -+ An are still too large. Pre­ dictions by another model RGM-H are less favorable, even for the very scarce experimental data presently available. The effect of the Coulomb force is estimated, and the effective range approximation is examined in the low-energy S-matrix. The important roles of the one-pion exchange tensor force and the antisymmetric spin-orbit force in the EN-AN coupling are discussed.

Scattering Observables of the NN and YN Interactions in the SU6 Quark Model

Scattering Observables of the NN and YN Interactions in the SU6 Quark Model

Unified description of N N and Y N interaction in the SU6 quark model

A simultaneous description of the N N and Y N interactions is possible in the resonating-group formulation of the spin-flavor SU 6 quark model, which incorporates the full Fermi-Breit interaction with explicit quark-mass dependence and the minimum meson-exchange potentials of scalar and pseudo-scalar meson nonets directly coupled to quarks. With a small number of parameters, satisfactory agreement with experiment is obtained for the N N properties and the total and differential cross sections of the Λ N and Σ N systems. The H-particle binding energy and Ξ - p total cross sections are also discussed.

Central Force of Baryon-Baryon Interactions with S=-2 in the SU6 Quark Model

Central Force of Baryon-Baryon Interactions with S=-2 in the SU6 Quark Model

Central Force of the Hyperon-Nucleon Interaction in the SU6 Quark Model

Characteristic properties of the medium·range central attraction of the nucleon·nucleon and hyperon-nucleon interactions are studied in the (3q)-(3q) resonating-group formulation. The SUs properties of two-baryon systems are extensively incorporated with the explicit flavor symmetry breaking of the full Fermi-Breit residual interaction. It is found that, for a realistic quark-model description of the hyperon-nucleon interaction compatible with the present low-energy experimental data, it is necessary to introduce phenomenological medium-range attraction which is much less than that for the nucleon-nucleon system. Effective meson-exchange potentials from the scalar-meson nonet exchange in the Nijmegen model-F are conveniently employed to generate the needed flavor­ dependent central attraction with few parameters determined for each flavor exchange symmetry.

PRODUCTION, STRUCTURE AND DECAY OF HYPERNUCLEI

PRODUCTION, STRUCTURE AND DECAY OF HYPERNUCLEI