174 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.
Constituent-quark model description of triply heavy-baryon nonperturbative lattice QCD data
This paper provides results for the spectra of triply charmed and bottom
baryons based on a constituent quark model approach. We take advantage of the
assumption that potential models are expected to describe triply heavy baryons
to a similar degree of accuracy as the successful results obtained in the
charmonium and bottomonium sectors. The high precision calculation of the
ground state and positive and negative parity excited states recently reported
by nonperturbative lattice QCD provides us with a unique opportunity to
confront model predictions with data. This comparison may also help to build a
bridge between two difficult to reconcile lattice QCD results, namely, the
lattice SU(3) QCD static three-quark potential and the recent results of
nonperturbative lattice QCD for the triply heavy-baryon spectra.Comment: 12 pages, 8 figure
Spectroscopy of doubly charmed baryons
We study the mass spectrum of baryons with two and three charmed quarks. For
double charm baryons the spin splitting is found to be smaller than standard
quark-model potential predictions. This splitting is not influenced either by
the particular form of the confining potential or by the regularization taken
for the contact term of the spin-spin potential. We consistently predict the
spectra for triply charmed baryons.Comment: 6 pages, 1 figure, accepted for publication in Phys. Rev.
Screened potential and the baryon spectrum
We show that in a quark model scheme the use of a screened potential,
suggested by lattice QCD, instead of an infinitely rising one with the
interquark distance, provides a more adequate description of the high-energy
baryon spectrum. In particular an almost perfect parallelism between the
predicted and observed number of states comes out throwing new light about the
so-called missing resonance problem.Comment: 11 pages, 6 figures, accepted for publication in Phys. Rev.
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