Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-12-18
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 1 figure, A talk given at International Workshop on PENTAQUARK04, SPring-8, Hyogo, Japan, 20-23 Jul 2004
Scientific paper
We present in this talk a recent analysis for the magnetic moments of the baryon antidecuplet within the framework of the chiral quark-soliton model with linear $m_s$ corrections considered. We take into account the mixing of higher representations to the collective magnetic moment operator, which comes from the SU(3) symmetry breaking. Dynamical parameters of the model are fixed by experimental data for the magnetic moments of the baryon octet as well as by the masses of the octet, decuplet and of $\Theta^{+}$. The magnetic moment of $\Theta^{+}$ is rather sensitive to the pion-nucleon sigma term and ranges from $-1.19 {\rm n.m.}$ to $-0.33 {\rm n.m.}$ as the sigma term is varied from $\Sigma_{\pi N} = 45$ to 75 MeV, respectively. On top of them, we obtained that the strange magnetic moment of the nucleon has the value of $\mu^{(s)}_N =+0.39$ n.m. within this scheme and turns out to be almost independent of the sigma term.
Goeke Klaus
Kim Hyun-Chul
Praszalowicz Michal
Yang Ghil-Seok
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