Valence quark contributions for the gamma N -> P11(1440) form factors
High Energy Physics - Phenomenology
2015-03-13 v3 High Energy Physics - Experiment
High Energy Physics - Lattice
Nuclear Experiment
Nuclear Theory
Abstract
Using a covariant spectator quark model we estimate valence quark contributions to the F1*(Q2) and F2*(Q2) transition form factors for the gamma N -> P11(1440) reaction. The Roper resonance, P11(1440), is assumed to be the first radial excitation of the nucleon. The present model requires no extra parameters except for those already fixed by the previous studies for the nucleon. Our results are consistent with the experimental data in the high Q2 region, and those from lattice QCD. We also estimate the meson cloud contributions, focusing on the low Q2 region, where they are expected to be dominant.
Keywords
Cite
@article{arxiv.1002.3386,
title = {Valence quark contributions for the gamma N -> P11(1440) form factors},
author = {G. Ramalho and Kazuo Tsushima},
journal= {arXiv preprint arXiv:1002.3386},
year = {2015}
}
Comments
11 pages, 5 figures. Published in Phys.Rev. D