A RELATIVISTIC STUDY OF THE NUCLEON HELICITY AMPLITUDES

We perform a calculation of the relativistic transition form factors f or the electromagnetic excitation of the nucleon resonances. We use as input the 3-quark wave functions obtained in a Constituent Quark Mode l with three-body forces in the hypercentral approach. With respect to the non relativistic calculations a significant contribution is obtai ned up to Q(2) similar or equal to 2(GeV/c)(2). However, the low Q(2)- behaviour exhibits a lack of strength, which may be connected with the need of taking into account explicitly further degrees of freedom bey ond the three constituent quark ones.