Soft Matrix Elements in Non-local Chiral Quark Model

Details Soft Matrix Elements in Non-local Chiral Quark Model Soft Matrix Elements in Non-local Chiral Quark Model

2009-11-10

arxiv.org/abs/0911.1906v1

PoS EPS-HEP2009 2009:444,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Presented in the poster session at The 2009 Europhysics Conference on High Energy Physics, 16-22 July 2009 Krakow, Poland. To

Scientific paper

Using non-local chiral quark model and currents satisfying Ward-Takahashi identities we analyze Distribution Amplitudes (DA) of photon and pion-to-photon Transition Distribution Amplitudes (TDA) in the low energy regime. Photon DA's are calculated analytically up to twist-4 and reveal several interesting features of photon structure. TDA's calculated in the present model satisfy polynomiality condition. Normalization of vector TDA is fixed by the axial anomaly. We also compute relevant form factors and compare them with existing data. Axial form factor turns out to be much lower then the vector one, what indeed is seen in the experimental data.

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