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The kaon electroproduction reaction 1H(e,e'K+)Lambda was studied as afunction of the virtual-photon four-momentum, Q2, total energy, W, and momentumtransfer, t, for different values of the virtual- photon polarizationparameter. Data were taken at electron beam energies ranging from 3.40 to 5.75GeV. The center of mass cross section was determined for 21 kinematicscorresponding to Q2 of 1.90 and 2.35 GeV2 and the longitudinal, sigmaL, andtransverse, sigmaT, cross sections were separated using the Rosenbluthtechnique at fixed W and t. The separated cross sections reveal a flat energydependence at forward kaon angles not satisfactorily described by existingelectroproduction models. Influence of the kaon pole on the cross sections wasinvestigated by adopting an off-shell form factor in the Regge model whichbetter describes the observed energy dependence of sigmaT and sigmaL.

Cross sections and Rosenbluth separations in 1H(e, e'K+)Lambda up to Q2=2.35 GeV2