Electromagnetic form factors of the nucleon in spacelike and timelike   regions
  An approach for a unified description of the nucleon electromagnetic form factors in spacelike and timelike regions is presented. The main ingredients of our model are: $i)$ a Mandelstam formula for the matrix elements of the nucleon electromagnetic current; $ii)$ a 3-dimensional reduction of the problem on the Light-Front performed within the so-called {\tt Propagator Pole Approximation} ({\bf PPA}), which consists in disregarding the analytical structure of the Bethe-Salpeter amplitudes and of the quark-photon vertex function in the integration over the minus components of the quark momenta; $iii)$ a dressed photon vertex in the $q\bar{q}$ channel, where the photon is described by its spin-1, hadronic component. 
J. P. B. C. de Melo (U. Cruzeiro do Sul), T. Frederico (ITA-CTA), E.   Pace (U. "Tor Vergata"), S. Pisano (U. "La Sapienza")...