Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-10-03
Phys.Rev. D70 (2004) 114002
Physics
High Energy Physics
High Energy Physics - Phenomenology
RevTeX is used. 12 pages, 3 figures, final version for publication in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.70.114002
We reanalyse the magnetic moments of the baryon octet, decuplet, and antidecuplet within the framework of the chiral quark-soliton model, with SU(3) symmetry breaking taken into account. We consider the contributions of the mixing of higher representations to the magnetic moment operator arising from the SU(3) symmetry breaking. Dynamical parameters of the model are fixed by experimental data for the magnetic moments of the baryon octet and from the masses of the octet, decuplet and of $\Theta^{+}$. The magnetic moment of $\Theta^{+}$ depends rather strongly on the pion-nucleon sigma term and reads $-1.19 {\rm n.m.}$ to $-0.33 {\rm n.m.}$ for $\Sigma_{\pi N} = 45$ and 75 MeV respectively. The recently reported mass of $\Xi^{--}_{\bar{10}}(1862)$ is compatible with $\Sigma_{\pi N} = 73$ MeV. As a byproduct the strange magnetic moment of the nucleon is obtained with a value of $\mu^{(s)}_N =+0.39$ n.m.
Goeke Klaus
Kim Hyun-Chul
Praszałowicz Michał
Yang Ghil-Seok
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