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Prog. Theor. Phys. Supplement No.168 (2007) pp. 62-69
Magnetic and Axial-Vector Transitions of the Baryon Antidecuplet
Hyun-Chul Kim,1,*
Ghil-Seok Yang2,** and
Klaus Goeke2,***
1Department of Physics, and Nuclear Physics &
Radiation Technology Institute (NuRI), Pusan National University, 609-735
Busan, Republic of Korea
2Institut für Theoretische Physik II, Ruhr-Universität Bochum,
D–44780 Bochum, Germany
Abstract:
We report the recent results of the magnetic transitions and
axial-vector transitions of the baryon antidecuplet within the
framework of the chiral quark-soliton model. The dynamical model
parameters are fixed by experimental data for the magnetic moments of
the baryon octet, for the hyperon semileptonic decay constants, and
for the singlet axial-vector constant. The transition magnetic
moments µΛΣ and µNΔ are well reproduced
and other octet-decuplet and octet-antidecuplet transitions are
predicted. In particular, the present calculation of
µΣΣ* is found to be below the upper bound
0.82µN that the SELEX collaboration measured very recently. The
results explains consistently the recent findings of a new N*
resonance from the GRAAL and Tohoku LNS group. We also obtain the
transition axial-vector constants for the Θ+ →KN from which
the decay width of the Θ+ pentaquark baryon is determined as
a function of the pion-nucleon sigma term ΣπN. We
investigate the dependence of the decay width of the Θ+
on the gA(0), with the gA(0) varied within the range
of the experimental uncertainty. We show that a small decay width
of the Θ+→KN, i.e. ΓΘKN ≤1 MeV, is
compatible with the values of all known semileptonic decays with the
generally accepted value of gA(0) ≈0.3 for the proton.
URL :
http://ptp.ipap.jp/link?PTPS/168/62/
DOI : 10.1143/PTPS.168.62
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