Pion transition form factor: interplay of hard and soft limits

Details Pion transition form factor: interplay of hard and soft limits Pion transition form factor: interplay of hard and soft limits

2002-06-10

arxiv.org/abs/hep-ph/0206088v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, Latex; Talk given at XXXVII Recontres de Moriond on QCD and Hadron Interaction, Les Arcs, France, 16-23 Ma

Scientific paper

The behaviour of the pion transition form factor for the process $\gamma^\star\gamma \to \pi^0$ and $\gamma^\star\gamma^\star\to \pi^0$ at space-like values of photon momenta is estimated within the nonlocal covariant quark-meson model. The nonlocal contributions are important to install the axial anomaly at zero photon virtualities and give the contributions to the twist-4 power correction to the form factor at large virtualities. The leading and next-to-leading order power asymptotics of the form factor and the relation between the light-cone pion distribution amplitudes and the dynamically generated quark mass function are found.

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