Electroexcitation of nucleon resonances at Q2=0.65(GeV/c)2 from a combined analysis of single- and double-pion electroproduction data -: art. no. 045201

Data on single- and double-charged-pion electroproduction off protons are successfully described in the second and third nucleon resonance regions with common N-* photocouplings. The analysis was carried out with separate isobar models for both reactions. From the combined analysis of two exclusive channels, the gamma(*)p -> N*+ helicity amplitudes are obtained for the resonances P-11(1440),D-13(1520),S-31(1620),S-11(1650),F-15(1680),D-33(1700),D-13(1700), and P-13(1720) at Q(2)=0.65(GeV/c)(2).