1,183 research outputs found
Omega photoproduction
Photoproduction of omega-meson is analyzed within meson exchange model and
Regge model and compared to rho-meson photoproduction. An interplay between two
models and uncertainties in data reproduction are discussed.Comment: Presented at Meson 2002, 7th Int. Workshop on Production, Properties
and Interaction of Mesons, Cracow, Poland, May 24-28 200
- and -hypernuclei
- and -hypernuclei are studied in the quark-meson
coupling (QMC) model. Comparisons are made with the results for
-hypernuclei studied in the same model previously. Although the scalar
and vector potentials felt by the , and in
the corresponding hypernuclei multiplet which has the same baryon numbers are
quite similar, the wave functions obtained, e.g., for state, are
very different. The baryon density distribution in
Pb is much more pushed away from the center than that for
the in Pb due to the Coulomb force. On the contrary,
the baryon density distributions in -hypernuclei are
much larger near the origin than those for the in the corresponding
-hypernuclei due to its heavy mass. It is also found that level
spacing for the single-particle energies is much smaller than that
for the and .Comment: Latex, 14 pages, 4 figures, text was extended, version to appear in
Phys. Rev.
A Faddeev Calculation for Pentaquark in Diquark Picture with Nambu-Jona-Lasinio Type Interaction
A Bethe-Salpeter-Faddeev (BSF) calculation is performed for the pentaquark
in the diquark picture of Jaffe and Wilczek in which is a
diquark-diquark- three-body system.
Nambu-Jona-Lasinio (NJL) model is used to calculate the lowest order diagrams
in the two-body scatterings of and . With the use of coupling
constants determined from the meson sector, we find that
interaction is attractive while interaction is repulsive, and there is no
bound pentaquark state. A bound pentaquark can only be
obtained with unphysically strong vector mesonic coupling constants.Comment: 4 pages, 4 figure
Quark-meson coupling model with the cloudy bag
Using the volume coupling version of the cloudy bag model, the quark-meson
coupling model is extended to study the role of pion field and the properties
of nuclear matter. The extended model includes the effect of gluon exchange as
well as the pion-cloud effect, and provides a good description of the nuclear
matter properties. The relationship between the extended model and the EFT
approach to nuclear matter is also discussed.Comment: 13 pages, 3 figure
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