Th. A. Rijken

A low lying scalar meson nonet in a unitarized meson model

AbstractA unitarized non-relativistic meson model which is successful for the description of the heavy and light vector and pseudo-scalar mesons yields in its extension to the scalar mesons for the same model parameters a complete nonet below 1 GeV. In the unitarization scheme real and virtual meson meson decay channels are coupled to the quark antiquark confinement channels. The flavor dependent harmonic oscillator confining potential itself has bound states ɛ(1.3 GeV),S(1.5 GeV), δ(1.3 GeV), κ(1.4 GeV), similar to the results of other bound stateq

Hyperon mixing and universal many-body repulsion in neutron stars

\bar q

ANTIPROTON-PROTON PARTIAL-WAVE ANALYSIS BELOW 925 MEV/C

models. However, the full coupled channel equations show poles at ɛ(0.5 GeV),S(0.99 GeV), δ(0.97 GeV), κ(0.73 GeV). Not only these pole positions can be calculated in our model also cross sections and phase shifts in the meson scattering channels which are in reasonable agreement with the available data for ππ, ηπ andKπ inS-wave scattering.

Extended-soft-core baryon-baryon model. I. Nucleon-nucleon scattering with the ESC04 interaction

SU(3) symmetry relations on the recently constructed hyperon-nucleon potentials are used to develop potential models for all possible baryon-baryon interaction channels. The main focus is on the interaction channels with total strangeness S={minus}2, {minus}3, and {minus}4, for which no experimental data exist yet. The potential models for these channels are based on SU(3) extensions of potential models for the S=0 and S={minus}1 sectors, which {ital are} fitted to experimental data. Although the SU(3) symmetry is not taken to be exact, the S=0 and S={minus}1 sectors still provide the necessary constraints to fix all free parameters. The potentials for the S={minus}2, {minus}3, and {minus}4 sectors, therefore, do not contain any additional free parameters, which makes them among the first models of this kind. Various properties of the potentials are illustrated by giving results for scattering lengths, bound states, and total cross sections. {copyright} {ital 1999} {ital The American Physical Society}

Multi-Pomeron repulsion and the neutron-star mass

A multi-Pomeron exchange potential (MPP) is proposed as a model for the universal many-body repulsion in baryonic systems on the basis of the extended soft core (ESC) baryon-baryon interaction. The strength of the MPP is determined by analyzing the nucleus-nucleus scattering with the

Meson-baryon coupling constants from a chiral-invariant SU(3) Lagrangian and application to NN scattering

G

Strangeness exchange in proton-antiproton reactions

-matrix folding model. The interaction in

Four-body structure of Li-7(Lambda) and Lambda N spin-dependent interaction

\ensuremath{\Lambda}N