Covariant Non-local Chiral Quark Model and Pion-photon Transition Distribution Amplitudes

Details Covariant Non-local Chiral Quark Model and Pion-photon Transition Distribution Amplitudes Covariant Non-local Chiral Quark Model and Pion-photon Transition Distribution Amplitudes

2009-07-23

arxiv.org/abs/0907.4044v2

Phys.Rev.D80:074002,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 7 figures, references updated, minor text changes

Scientific paper

10.1103/PhysRevD.80.074002

Using non-local chiral quark model with simple pole ansatz for mass dependence on momentum and non-local currents satisfying Ward-Takahashi identities, we calculate pion to photon transition distribution amplitudes and relevant form factors. For vector amplitude we recover correct normalization fixed by the axial anomaly. We find that due to the non-locality in the vector current, the value of axial form factor at zero momentum transfer is lowered with respect to the vector form factor. Such behaviour - consistent with experiment - is not seen in the local models. Where possible we compare our results to the experimental data.

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