Electroproduction of ?+ mesons at forward and backward direction in the region of theD 13(1520) andF 15(1688) resonances

We report on measurements of the reactionep→enπ+ in the region of theD13(1520) andF15(1688) resonances. At an invariant four-momentum transferq2=0.3 (GeV/c)2 the outgoing pion was detected in the forward and backward directions. The values of the helicity-1/2-partial wave amplitudesA2−(D13(1520)) andA3−(F15(1688)) are determined from these measurements. A comparison of the results with single quark transition models is made.