Soft Matrix Elements in Non-local Chiral Quark Model
Abstract
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.
Keywords
Cite
@article{arxiv.0911.1906,
title = {Soft Matrix Elements in Non-local Chiral Quark Model},
author = {Piotr Kotko},
journal= {arXiv preprint arXiv:0911.1906},
year = {2014}
}
Comments
Presented in the poster session at The 2009 Europhysics Conference on High Energy Physics, 16-22 July 2009 Krakow, Poland. To appear in Proceedings of Science