E2/M1 and C2/M1 at ELSA

At the ELectron Stretcher Accelerator ELSA the four momentum transfer dependence of the N to Delta transition has been investigated by measuring the upsilon(pi)(*) and psi(pi)(*) angular distribution of the double differential pion production cross sections in a series of electron scattering coincidence experiments on hydrogen in the -K-2-range from 0.04 GeV2 to 0.8 GeV2. The azimuthal angular dependence of the hadronic cross section is based on the polarization of the virtual photon and separates the response functions R-T + epsilon(L)R(L), R-LT and R-TT. Whereas the individual upsilon(pi)(*)-dependences of these response functions allow to form specific ratios, which are sensitive either to the electric transverse (E2 or E1+) or the Coulomb (C2 or S1+) quadrupole transition amplitudes. Preliminary results on the extraction of such multipole ratios have been previously reported in the NSTAR 2000 proceedings(1). First results for a -K-2 of 0.638 GeV2 obtained after radiative and resolution dependent corrections are described here and compared to other most recent experimental results.