Photon Distribution Amplitudes in nonlocal chiral quark model
High Energy Physics - Phenomenology
2010-06-23 v2
Abstract
Photon distribution amplitudes up to twist four are calculated within the nonlocal chiral quark model with a simple pole ansatz for momentum dependence of the constituent quark mass. Calculations are performed using modified electromagnetic vector current in order to satisfy Ward identities. Quark condensate and magnetic susceptibility of the QCD vacuum entering definitions of the distribution amplitudes are computed and compared with existing phenomenological estimates. Both real and off-shell photons are considered and relevant form factors are calculated. Our results are analytical up to the numerical solution of certain algebraic equation.
Keywords
Cite
@article{arxiv.0912.0029,
title = {Photon Distribution Amplitudes in nonlocal chiral quark model},
author = {Piotr Kotko and Michal Praszalowicz},
journal= {arXiv preprint arXiv:0912.0029},
year = {2010}
}
Comments
38 pages, 9 figures. Refs. added