Off-Shell Axial Anomaly via the γ^* π^0 -> γTransition

Details Off-Shell Axial Anomaly via the γ^* π^0 -> γTransition Off-Shell Axial Anomaly via the γ^* π^0 -> γTransition

1994-12-02

arxiv.org/abs/hep-ph/9412219v1

Phys.Lett.B359:17-22,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 Pages, 3 figures (uuencoded and appended), REVTEX

Scientific paper

10.1016/0370-2693(95)01065-X

The $\gamma^* \pi^0 \rightarrow \gamma$ 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 \mbox{$Q^2 \geq 20~{\rm GeV}^2$}.

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