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Cross section measurements of the exclusive p(e,e'K+)Lambda,Sigma^0electroproduction reactions have been performed at the Mainz Microtron MAMI inthe A1 spectrometer facility using for the first time the Kaos spectrometer forkaon detection. These processes were studied in a kinematical region notcovered by any previous experiment. The nucleon was probed in its thirdresonance region with virtual photons of low four-momenta, Q^2= 0.030-0.055(GeV/c)^2. The MAMI data indicate a smooth transition in Q^2 fromphotoproduction to electroproduction cross sections. Comparison withpredictions of effective Lagrangian models based on the isobar approach revealthat strong longitudinal couplings of the virtual photon to the N* resonancescan be excluded from these models.

Exclusive electroproduction of K+ Lambda and K+ Sigma^0 final states at Q^2 = 0.030-0.055 (GeV/c)^2