1999/12/24 by Derek B. Leinweber, A. W. Thomas, Anthony W. Thomas · 62 citations
Earth and Planetary Sciences · Physics and Astronomy · #Atomic and Subatomic Physics Research #Baryon #Condensed matter physics #Electron magnetic dipole moment #High-pressure geophysics and materials #Lattice QCD #Magnetic dipole #Magnetic field #Magnetic moment #Neutron magnetic moment #Nuclear physics #Nucleon #Particle physics #Physics #Proton magnetic moment #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Strange quark #Strangeness #Valence (chemistry) #hep-ex #hep-lat #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevd.62.074505
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 62(7) (American Physical Society) · RevTeX, 20 pages, 12 figures
arxiv created 1999/12/24 · openalex publication_date 2000/09/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The outcome of the SAMPLE experiment suggests that the strange-quark contribution to the nucleon magnetic moment, GMs(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 \ensuremathΞ0 magnetic moment. This hitherto unforeseen result leads to the value GMs(0)=\ensuremath-0.16\ifmmode±\else\textpm\fi0.18 with a systematic error, arising from the relatively large strange quark mass used in existing lattice calculations, that would tend to shift GMs(0) towards small positive values.