EXCHANGE CURRENTS IN PHOTOPRODUCTION OF THE DELTA(1232) AND N-ASTERISK(1440) RESONANCES

We calculate the photoexcitation amplitudes for the gamma + N --> Delt a(1232) and gamma + N --> N(1440) transitions in the chiral quark mod el including two-body exchange currents. We show that the contribution s from the various two-body currents are important. Compared with pres ent experimental data we see a slight worsening for the N - Delta exci tation but a small improvement for the transition to the Roper resonan ce (N(1440)) with respect to the impulse approximation.