A light-front Quark Model for the electromagnetic form factor of the pion

Abstract

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.

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)