Electroexcitation of the Roper resonance in relativistic quark models

The amplitudes of the transition γ*N→P₁₁(1440) are calculated within light-front relativistic quark model assuming that the P₁₁(1440) is the first radial excitation of the $3q$ ground state. The results are presented along with the predictions obtained in other relativistic quark models. In comparison with the previous calculations, we have extended the range of Q² up to 4.5 GeV² to cover the kinematic interval of the forthcoming experimental data. Using approach based on the hypothesis of partially conserved axial-vector current, we checked the relative sign between quark model predictions for the N and P₁₁(1440) contributions to the {π} electroproduction found in previous investigations.