Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/11177
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Type: Journal article
Title: Lattice QCD analysis of the strangeness magnetic moment of the nucleon
Author: Leinweber, D.
Thomas, A.
Citation: Physical Review. D. Particles, Fields, Gravitation and Cosmology, 2000; 62(7):www1-www10
Publisher: American Physical Soc
Issue Date: 2000
ISSN: 1550-7998
0556-2821
Statement of
Responsibility: 
Derek B. Leinweber and Anthony W. Thomas
Abstract: The outcome of the SAMPLE Experiment suggests that the strange-quark contribution to the nucleon magnetic moment, G_M^s(0), may be greater than zero. This result is very difficult to reconcile with expectations based on the successful baryon magnetic-moment phenomenology of the constituent quark model. We show that careful consideration of chiral symmetry reveals some rather unexpected properties of QCD. In particular, it is found that the valence u-quark contribution to the magnetic moment of the neutron can differ by more than 50% from its contribution to the Xi^0 magnetic moment. This hitherto unforeseen result leads to the value G_M^s(0) = -0.16 +/- 0.18 with a systematic error, arising from the relatively large strange quark mass used in existing lattice calculations, that would tend to shift G_M^s(0) towards small positive values.
Rights: ©2000 American Physical Society
RMID: 0001001092
DOI: 10.1103/PhysRevD.62.074505
Appears in Collections:Special Research Centre for the Subatomic Structure of Matter publications

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