Holographic estimate of the meson cloud contribution to nucleon axial form factor
Abstract
We use light-front Holography to estimate the valence quark and the meson cloud contributions to the nucleon axial form factor. The free couplings of the holographic model are determined by the empirical data and by the information extracted from lattice QCD. The holographic model provides a good description of the empirical data when we consider a meson cloud mixture of about 30\% in the physical nucleon state. The estimate of the valence quark contribution to the nucleon axial form factor compares well with the lattice QCD data for small pion masses. Our estimate of the meson cloud contribution to the nucleon axial form factor has a slower falloff with the square momentum transfer compared to typical estimates from quark models with meson cloud dressing.
Keywords
Cite
@article{arxiv.1707.07206,
title = {Holographic estimate of the meson cloud contribution to nucleon axial form factor},
author = {G. Ramalho},
journal= {arXiv preprint arXiv:1707.07206},
year = {2018}
}
Comments
14 pages, 5 figures. Published version. Extension of the first version