The off-shell axial anomaly via the {gamma}*{pi}{sup 0} {yields} {gamma} transition

Technical Report ·

OSTI ID:973843

Frank, M R ^[1]; Mitchell, K L; Tandy, P C ^[2]; Roberts, C D ^[3]

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1. Univ. of Washington, Seattle, WA (United States). Institute for Nuclear Theory
2. Kent State Univ., OH (United States)
3. Argonne National Lab., IL (United States)

The {gamma}*{pi}{sup 0} {yields} {gamma} form factor, including the extension off the pion mass-shell, is obtained from a generalized impulse approximation within a QCD-based model field theory known to provide an excellent description of the pion charge form factor. This approach implements dressing of the vertex functions and propagators consistent with dynamical chiral symmetry breaking, gauge invariance, quark confinement and perturbative QCD. Soft nonperturbative behavior, dictated by the axial anomaly, is found to evolve to the perturbative QCD limit only for Q{sup 2} {ge} 20 GeV{sup 2}.

• Research Organization: Washington Univ., Seattle, WA (United States). Inst. for Nuclear Theory; Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG06-90ER40561; W-31109-ENG-38
• OSTI ID: 973843
• Report Number(s): DOE/ER/40561--172; ON: DE95004762; IN: INT94-00-76; CNN: National Science Foundation Grant PHY-91-13117; National Science Foundation Grant INT92-15223; National Science Foundation Grant PHY94-14291
• Country of Publication: United States
• Language: English

Related Subjects

662420
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
FORM FACTORS
PIONS NEUTRAL
PROPERTIES OF MESONS AND MESON RESONANCES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
VERTEX FUNCTIONS