245 research outputs found
Constituent quark model study of light- and strange-baryon spectra
We investigate the structure of the SU(3) octet and decuplet baryons
employing a constituent quark model designed for the study of the baryon-baryon
interaction and successfully applied to the meson spectra. The model considers
through the interacting potential perturbative, one-gluon exchange, and
non-perturbative, boson exchanges and confinement, aspects of the underlying
theory, QCD. We solve the three-quark problem by means of the Faddeev method in
momentum space. We analyze the effect of the different terms in the interaction
and make contact with the use of relativistic kinematics. We find an
explanation to the strong contribution of the pseudoscalar forces in the
semirelativistic approach for the octet baryons. A phenomenological recipe for
the regularization parameter of the one-gluon exchange is found.Comment: 17 pages, 6 figures, accepted for publication in Phys. Rev.
Does the quark cluster model predict any isospin two dibaryon resonance?
We analyze the possible existence of a resonance in the channel
with isospin two by means of nucleon- interactions based on the
constituent quark model. We solve the bound state and the scattering problem
using two different potentials, a local and a non-local one. The non-local
potential results to be the more attractive, although not enough to generate
the experimentally predicted resonance.Comment: 9 pages in Latex (revtex), 2 eps figures available under reques
scattering lengths from a quark-model based interaction
We calculate the doublet and quartet neutron-deuteron scattering lengths
using a nonlocal nucleon-nucleon interaction fully derived from quark-quark
interactions. We use as input the and - partial
waves. Our result for the quartet scattering length agrees well with the
experimental value while the result for the doublet scattering length does not.
However, if we take the result for the doublet scattering length together with
the one for the triton binding energy they agree well with the so-called
Phillips line.Comment: 6 pages, 2 tables. Accepted for publication in Physical Review
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