In this contribution, an approach for a unified description of the pion electromagnetic form factor, in the space- and time-like regions, within a constituent quark model on the light front, will be reviewed. Our approach is based on i) the on-shell quark-hadron vertex functions in the valence sector, ii) the dressed photon vertex where a photon decays in a quark-antiquark pair, and iii) the emission and absorption amplitudes of a pion by a quark. Results favorably compare with the existing experimental data.
@article{arxiv.hep-ph/0503008,
title = {A light-front Quark Model for the electromagnetic form factor of the pion},
author = {J. P. B. C. de Melo and T. Frederico and E. Pace and G. Salme`},
journal= {arXiv preprint arXiv:hep-ph/0503008},
year = {2017}
}
Comments
Proceedings of X Italian Meeting on "Problems in Theoretical Nuclear Physics", Cortona Oct. 6-9, 2004. To appear in World Scientific Nuclear Physics Series (Singapore)