Dressing the electromagnetic nucleon current

Journal Article · Wed Jun 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.065502· OSTI ID:21502820

Haberzettl, H ^[1]; Huang, F ^[2]; Nakayama, K ^[2]

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1. Center for Nuclear Studies, Department of Physics, George Washington University, Washington, DC 20052 (United States)
2. Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602 (United States)

A field-theory-based approach to pion photoproduction off the nucleon is used to derive a microscopically consistent formulation of the fully dressed electromagnetic nucleon current in an effective Lagrangian formalism. It is shown how the rigorous implementation of local gauge invariance at all levels of the reaction dynamics provides equations that lend themselves to practically manageable truncations of the underlying nonlinearities of the problem. The requirement of consistency also suggests a novel way of treating the pion photoproduction problem. Guided by a phenomenological implementation of gauge invariance for the truncated equations that has proved successful for pion photoproduction, an expression for the fully dressed nucleon current is given that satisfies the Ward-Takahashi identity for a fully dressed nucleon propagator as a matter of course. Possible applications include meson photo- and electroproduction processes, bremsstrahlung, Compton scattering, and ee{sup '} processes off nucleons.

• OSTI ID: 21502820
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BASIC INTERACTIONS
BOSONS
BREMSSTRAHLUNG
COMPTON EFFECT
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTROPRODUCTION
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FUNCTIONS
GAUGE INVARIANCE
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
LAGRANGIAN FUNCTION
MESONS
NONLINEAR PROBLEMS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTOPRODUCTION
PIONS
PSEUDOSCALAR MESONS
RADIATIONS
SCATTERING
SIMULATION