Timelike and spacelike hadron form factors, Fock state components and   light-front dynamics
  A unified description of spacelike and timelike hadron form factors within a light-front model was successfully applied to the pion. The model is extended to the nucleon to study the role of $q \bar q$ pair production and of nonvalence components in the nucleon form factors. Preliminary results in the spacelike range $0 \le Q^2 \le 10 ~ (GeV/c)^2$ are presented. 
E. Pace (Univer. di Roma "Tor Vergata"), G. Salme` (INFN - Sezione di   Roma), T. Frederico (ITA-CTA, S. Jose` dos Campos), ...