A light-front Quark Model for the electromagnetic form factor of the   pion
  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. 
J. P. B. C. de Melo (IFT and CETEC), T. Frederico (ITA-CTA), E. Pace   (Tor Vergata), G. Salme` (INFN)