The chiral anomaly form factor of the {gamma}{sup *}{pi}{degrees} {yields} {gamma} transition
Journal Article
·
· Bulletin of the American Physical Society
OSTI ID:374707
The {gamma}{sup *}{pi} {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. This approach implements dressing of the vertex functions and propagators consistent with dynamical chiral symmetry breaking, gauge invariance, quark confinement and perturbative QCD. The calculation is completely specified by the quark propagator amplitudes which are here fixed by soft chiral physics and the pion charge form factor. 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}. The obtained behavior away from the pion mass-shell can help assess the role of the corresponding mechanism for virtual Compton scattering.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38; FG06-90ER40561
- OSTI ID:
- 374707
- Report Number(s):
- CONF-9304297--; CNN: Grant PHY94-14291
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN 0003-0503; ISSN BAPSA6
- Country of Publication:
- United States
- Language:
- English
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