Form factors and gauge invariance in pion photoproduction

Journal Article · Fri May 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.2511· OSTI ID:7183351

Workman, R L ^[1]; Naus, H W.L. ^[2]; Pollock, S J ^[3]

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1. Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (United States)
2. Institute for Theoretical Physics, University of Erlangen-Nuernberg, W-8520 Erlangen (Germany)
3. Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195 (United States)

We consider the effect of strong-vertex form factors on the gauge invariance of Born diagrams for the pion photoproduction reaction. The minimal-substitution prescription of Ohta for the electromagnetic current operator in pion photoproduction yields the same result as the simplest Born approach for one particular invariant amplitude. This is incompatible with recipes that multiply the Born amplitude by an overall form factor.

• DOE Contract Number: AS05-76ER04928; FG06-90ER40561
• OSTI ID: 7183351
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663410* -- Photonuclear Reactions & Photon Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
BORN APPROXIMATION
BOSONS
ELECTROMAGNETIC FORM FACTORS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FORM FACTORS
GAUGE INVARIANCE
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
MESONS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
PIONS
PSEUDOSCALAR MESONS
RELATIVISTIC RANGE