Note on the magnetic moment of the nucleon

Details Note on the magnetic moment of the nucleon Note on the magnetic moment of the nucleon

2008-05-19

arxiv.org/abs/0805.2823v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

The Goldberger-Treiman relation $M=2\pi/\sqrt{3}f^{\rm cl}_\pi$ where $M$ is the constituent quark mass in the chiral limit (cl) and $f^{\rm cl}_\pi$ the pion decay constant in the chiral limit predicts constituent quark masses of $m_u=328.8\pm 1.1$ MeV and $m_d=332.3\pm 1.1$ MeV for the up and down quark, respectively, when $f^{\rm cl}_\pi=89.8\pm 0.3$ MeV is adopted. Treating the constituent quarks as bare Dirac particles the following zero order values $\mu^{(0)}}_p=2.850\pm 0.009$ and $\mu^{(0)}}_n= -1.889\pm 0.006$ are obtained for the proton and neutron magnetic moments, leading to deviations from the experimental data of 2.0% and 1.3%, respectively. These unavoidable deviations are discussed in terms of contributions to the magnetic moments proposed in previous work.

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