6,630 research outputs found
Structure of heavy baryons in a pion mean-field approach
In this talk, we briefly review a series of recent works on singly heavy
baryons, based on a pion mean-field approach. In the limit of the infinitely
heavy quark mass, heavy baryons are governed mainly by the light degress of
freedom. Taking the number of colors to be infinity, a heavy baryon arises as a
state consisting of valence quarks bound by the pion mean fields
created self-consistently. Within this framework, we present the results of the
mass spectra of the charmed and bottom baryons, and their magnetic moments. The
behavior of the electromagnetic form factors will be also mentioned.Comment: 4 pages, No figure. Contribution to the proceedings of "8th
International Conference on Quarks and Nuclear Physics (QNP2018)", November
13-17, 2018, Tsukuba, Japa
Photoproduction with Nucleon Resonances
We investigate the reaction mechanism of photoproduction off
the neutron target, i.e., , in the range of GeV. We employ an effective Lagrangian method at the tree-level Born
approximation combining with a Regge approach. As a background, the
-Reggeon trajectory is taken into account in the channel and
and hyperons in the -channel Feynman diagram. In addition, the role
of various nucleon resonances listed in the Particle Data Group (PDG) is
carefully scrutinized in the channel where the resonance parameters are
extracted from the experimental data and constituent quark model. We present
our numerical results of the total and differential cross sections and compare
them with the recent CLAS data. The effect of the narrow nucleon resonance
on cross sections is studied in detail and it turns out that
its existence is essential in photoproduction to reproduce the
CLAS data.Comment: 4 pages, 3 figures, Proceedings of "8th International Conference on
Quarks and Nuclear Physics (QNP2018)", November 13-17, 2018, Tsukuba, Japa
Electromagnetic form factors of the baryon decuplet with flavor SU(3) symmetry breaking
We investigate the electromagnetic form factors of the baryon decuplet within
the framework of the self-consistent chiral quark-soliton
model, taking into account the rotational corrections and the effects
of flavor symmetry breaking. We first examine the valence- and
sea-quark contributions to each electromagnetic form factor of the baryon
decuplet and then the effects of the flavor SU(3) symmetry breaking. The
present results are in good agreement with the recent lattice data. We also
compute the charge radii, the magnetic radii, the magnetic dipole moments and
the electric quadrupole moments, comparing their results with those from other
theoretical works. We also make a chiral extrapolation to compare the present
results with the lattice data in a more quantitative manner. The results show
in general similar tendency to the lattice results. In particular, the results
of the and form factors are in good agreement with those of lattice
QCD.Comment: 29 pages, 15 figures. Comparison with the lattice data was elaborate
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