Lattice calculation of the strangeness magnetic moment of the nucleon
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
- Special Research Center for the Subatomic Structure of Matter and Department of Physics and Mathematical Physics, University of Adelaide, 5005 (Australia)
We report on a lattice QCD calculation of the strangeness magnetic moment of the nucleon. Our result is G{sub M}{sup s}(0)={minus}0.36{plus_minus}0.20. The sea contributions from the u and d quarks are about 80{percent} larger. However, they cancel to a large extent due to their electric charges, resulting in a smaller net sea contribution of {minus}0.097{plus_minus}0.037{mu}{sub N} to the nucleon magnetic moment. As far as the neutron to proton magnetic moment ratio is concerned, this sea contribution tends to cancel out the cloud-quark effect from the Z graphs and results in a ratio of {minus}0.68{plus_minus}0.04 which is close to the SU(6) relation and the experiment. The strangeness Sachs electric mean-square radius {l_angle}r{sub s}{sup 2}{r_angle}{sub E} is found to be small and negative. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 658520
- Journal Information:
- Physical Review, D, Vol. 58, Issue 7; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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