Transition form factors and helicity amplitudes for electroexcitation of negative and positive parity nucleon resonances in a light-front quark model

A workable basis of quark configurations s³, s²p and s p² at light front has been constructed to describe the high-Q² behavior of transition form factors and helicity amplitudes in the electroproduction of the lightest nucleon resonances, N_{1 /2^-}(1535 ) and N_{1 /2⁺}(1440 ). High-quality data of the CLAS Collaboration are described in the framework of a model which takes into account mixing of the quark configurations and the hadron-molecular states. The model allows for a rough estimate of the quark core weight in the wave function of the resonance in a comparison with high momentum transfer data on resonance electroproduction.