Chiral extrapolation of nucleon magnetic form factors

Journal Article · Sun Apr 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.073012· OSTI ID:21020249

Wang, P ^[1]; Leinweber, D B ^[2]; Thomas, A W; Young, R D ^[3]

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1. Physics Department, North Carolina State University, Raleigh, North Carolina 27695 (United States)
2. Special Research Center for the Subatomic Structure of Matter (CSSM) and Department of Physics, University of Adelaide 5005 (Australia)
3. Jefferson Laboratory, 12000 Jefferson Ave., Newport News, Virginia 23606 (United States)

The extrapolation of nucleon magnetic form factors calculated within lattice QCD is investigated within a framework based upon heavy baryon chiral effective-field theory. All one-loop graphs are considered at arbitrary momentum transfer and all octet and decuplet baryons are included in the intermediate states. Finite range regularization is applied to improve the convergence in the quark-mass expansion. At each value of the momentum transfer (Q{sup 2}), a separate extrapolation to the physical pion mass is carried out as a function of m{sub {pi}} alone. Because of the large values of Q{sup 2} involved, the role of the pion form factor in the standard pion-loop integrals is also investigated. The resulting values of the form factors at the physical pion mass are compared with experimental data as a function of Q{sup 2} and demonstrate the utility and accuracy of the chiral extrapolation methods presented herein.

• OSTI ID: 21020249
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
CHIRALITY
ELECTROMAGNETIC FORM FACTORS
EXTRAPOLATION
FOUR MOMENTUM TRANSFER
INTERMEDIATE STATE
LATTICE FIELD THEORY
NUCLEONS
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
REST MASS