Quark Contributions to Baryon Magnetic Moments in Full, Quenched and Partially Quenched QCD

Abstract

The chiral nonanalytic behaviour of quark-flavor contributions to the magnetic moments of octet baryons are determined in full, quenched and partially-quenched QCD, using an intuitive and efficient diagrammatic formulation of quenched and partially-quenched chiral perturbation theory. The technique provides a separation of quark-sector magnetic-moment contributions into direct sea-quark loop, valence-quark, indirect sea-quark loop and quenched valence contributions, the latter being the conventional view of the quenched approximation. Both meson and baryon mass violations of SU(3)-flavor symmetry are accounted for. Following a comprehensive examination of the individual quark-sector contributions to octet baryon magnetic moments, numerous opportunities to observe and test the underlying structure of baryons and the nature of chiral nonanalytic behavior in QCD and its quenched variants are discussed. In particular, the valence u-quark contribution to the proton magnetic moment provides the optimal opportunity to directly view nonanalytic behavior associated with the meson cloud of full QCD and the quenched meson cloud of quenched QCD. The u quark in Sigma^+ provides the best opportunity to display the artifacts of the quenched approximation.

Published version of the RevTeX 4 manuscript, 6 figures, 24 tables, 22 pages

References in corpus (7)

• Convergence of chiral effective field theory
• The nucleon's strange electromagnetic and scalar matrix elements
• Delta Baryon Magnetic Moments From Lattice QCD
• Panel discussion on chiral extrapolation of physical observables
• FLIC Fermions and Hadron Phenomenology
• Strange matrix elements of the nucleon
• Chiral Nonanalytic Behaviour: The Edinburgh Plot

Cited by in corpus (46)

• Baryons as relativistic three-quark bound states
• Precise determination of the strangeness magnetic moment of the nucleon
• Limits on the temporal variation of the fine structure constant, quark masses and strong interaction from quasar absorption spectra and atomic clock experiments
• Nucleon electromagnetic form factors on the lattice and in chiral effective field theory
• Precision Electromagnetic Structure of Octet Baryons in the Chiral Regime
• Nucleon Masses and Magnetic Moments in a Finite Volume
• Baryon magnetic moments in the background field method
• High-precision calculation of the strange nucleon electromagnetic form factors
• Magnetic form factors of the octet baryons from lattice QCD and chiral extrapolation
• Leading Quenching Effects in the Proton Magnetic Moment
• Octet Baryon Masses in Partially Quenched Chiral Perturbation Theory
• Decuplet Baryon Masses in Partially Quenched Chiral Perturbation Theory
• Strange magnetic form factor of the proton at $Q^2=0.23$ GeV${}^2$
• Chiral extrapolation of octet-baryon charge radii
• Electric form factors of the octet baryons from lattice QCD and chiral extrapolation
• Magnetic properties of the nucleon in a uniform background field
• Finite-volume and partial quenching effects in the magnetic polarizability of the neutron
• Light-quark contributions to the magnetic form factor of the Lambda(1405)
• Magnetic polarisability of the nucleon using a Laplacian mode projection
• Improved chiral properties of FLIC fermions
• New Quark Relations for Hadron Masses and Magnetic Moments - A Challenge for Explanation from QCD
• Systematic uncertainties in the precise determination of the strangeness magnetic moment of the nucleon
• Unified chiral analysis of the vector meson spectrum from lattice QCD
• Hyperon elastic electromagnetic form factors in the space-like momentum region
• Determination of the strange nucleon form factors
• An analysis of the nucleon spectrum from lattice partially-quenched QCD
• Chiral extrapolation of nucleon magnetic moments at next-to-leading-order
• Opposite-Parity Contaminations in Lattice Nucleon Form Factors
• The spin of the proton in chiral effective field theory
• Chiral Effective Theory Methods and their Application to the Structure of Hadrons from Lattice QCD
• Observing Chiral Nonanalytic Behavior with FLIC Fermions
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Chiral extrapolation of the charged-pion magnetic polarizability with Padé approximant
• Charge Symmetry Violation in the Electromagnetic Form Factors of the Proton
• Chiral extrapolation of the magnetic polarizability of the neutral pion
• Singlet baryons in the graded symmetry approach to partially quenched QCD
• Chiral Analysis of the Nucleon Mass and Sigma Commutator
• Reflections on Chiral Symmetry within QCD
• Magnetic Polarisability of Octet Baryons via Lattice QCD
• Sea quark contributions to nucleon electromagnetic form factors with the nonlocal chiral effective Lagrangian
• Hyperon Form Factors from N_f=2+1 QCD
• Chiral Perturbation Theory on the Lattice and its Applications
• The strangeness magnetic moment of the nucleon from FLIC fermions
• Light quark electromagnetic structure of baryons
• Sea quark contributions to the electromagnetic form factors of $\Sigma$ hyperons
• Baryon magnetic moments in the external field method