A Lattice QCD Analysis of the Strangeness Magnetic Moment of the Nucleon

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.

RevTeX, 20 pages, 12 figures

References in corpus (5)

• Baryon Masses from Lattice QCD: Beyond the Perturbative Chiral Regime
• Parity Violation in Elastic Electron-Proton Scattering and the Proton's Strange Magnetic Form Factor
• Baryon Mass Extrapolation
• Chiral Corrections to Baryon Masses Calculated within Lattice QCD
• Non-perturbative chiral corrections for lattice QCD

Cited by in corpus (43)

• The Strange Quark Contribution to the Proton's Magnetic Moment
• Chiral extrapolation of lattice moments of proton quark distributions
• Precise determination of the strangeness magnetic moment of the nucleon
• Chiral Analysis of Quenched Baryon Masses
• The SAMPLE Experiment and Weak Nucleon Structure
• Precision Electromagnetic Structure of Octet Baryons in the Chiral Regime
• Parity-Violating Electron Scattering and Neucleon Structure
• Chiral Behaviour of the Rho Meson in Lattice QCD
• The nucleon's strange electromagnetic and scalar matrix elements
• Strange nucleon form factors in the perturbative chiral quark model
• Heavy quark physics from lattice QCD
• Leading Quenching Effects in the Proton Magnetic Moment
• Quark Contributions to Baryon Magnetic Moments in Full, Quenched and Partially Quenched QCD
• Strange magnetic form factor of the proton at $Q^2=0.23$ GeV${}^2$
• Strange Quark Magnetic Moment of the Nucleon at Physical Point
• Magnetic properties of the nucleon in a uniform background field
• Chiral Extrapolation of Hadronic Observables
• Strange form factors in the context of SAMPLE, HAPPEX, and A4 experiments
• Simple Quark Model with Chiral Phenomenology
• Light-quark contributions to the magnetic form factor of the Lambda(1405)
• Semi-leptonic decays of heavy mesons and the Isgur-Wise function in quenched lattice QCD
• Strange magnetic form factor of nucleon in heavy baryon chiral effective approach at next to leading order
• Determination of the strange nucleon form factors
• Spin and orbital angular momentum of the proton
• The Chiral Extrapolation of Strange Matrix Elements in the Nucleon
• First Nonperturbative Test of a Relativistic Heavy Quark Action in Quenched Lattice QCD
• Strange Vector Form Factors from Parity-Violating Electron Scattering
• Strangeness magnetic form factor of the proton in the extended chiral quark model
• Chiral extrapolation of lattice data for B-meson decay constant
• Pure sea-quark contributions to the magnetic form factors of $\Sigma$ baryons
• Baryon Tri-local Interpolating Fields
• Strange quarks and lattice QCD
• Chiral extrapolation of lattice data for the hyperfine splittings of heavy mesons
• Heavy-quark contribution to the proton's magnetic moment
• Chiral Extrapolation of Lattice Data for Heavy Baryons
• Recent Developments in Quark Nuclear Physics
• Unravelling strange quarks in nucleon structure
• Parity Violating Effects in Elastic Electron Deuteron Scattering
• The strangeness magnetic moment of the nucleon from FLIC fermions
• Strange Vector Form Factor of Kaons
• Chiral Extrapolation of Lattice Data for Heavy Meson Hyperfine Splittings
• Overview of Issues Surrounding Strangeness in the Nucleon
• Strangeness contributions to nucleon form factors