The eta (eta') gamma transition form factor and the gluon-gluon distribution amplitude
High Energy Physics - Phenomenology
2025-01-09 v2
Abstract
The eta-gamma and eta'-gamma transition form factors are analyzed to leading-twist accuracy and next-to-leading order (NLO) of perturbative QCD. Using an eta-eta' mixing scheme and all currently available experimental data the lowest Gegenbauer coefficients of the distribution amplitudes for the valence octet and singlet quark-antiquark and the gluon-gluon Fock components are extracted. Predictions for the g*g*eta' vertex function are presented. We also comment on the new BELLE results for the pi-gamma transition form factor.
Keywords
Cite
@article{arxiv.1206.4870,
title = {The eta (eta') gamma transition form factor and the gluon-gluon distribution amplitude},
author = {Peter Kroll and Kornelija Passek-Kumericki},
journal= {arXiv preprint arXiv:1206.4870},
year = {2025}
}
Comments
28 pages, 13 figures, the paper is shortened, the references are updated and the title changed