Positive strangeness contribution to the nucleon magnetic moment in a relativistic chiral potential model
X. B. Chen, X. S. Chen, Amand Faessler, Th. Gutsche, F. Wang
Abstract
The strangeness contribution to the nucleon magnetic moment is calculated at the one-loop level in a relativistic SU(3) chiral potential model and is found to be positive, that is, with an opposite sign to the nucleon strangeness polarization. It is the ``Z'' diagram that violates the usual relation between spin and magnetic moment. The positive value is due to the contribution from the intermediate excited quark states, while the intermediate ground state gives a negative contribution. Our numerical results agree quite well with the new measurement of the SAMPLE Collaboration.
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