Separation of σL and σU in π+-electroproduction above the resonance region

The four cross section components σU, σL, σP and σI were separated in the reaction γV+ p → π+ + n at an electron four momentum transfer of Q2 = 0.70 GeV2 and an invariant hadronic mass of 2.19 GeV in the range of t between tmin and −0.28 GeV2. The longitudinal cross section σL dominates at small |t| and decreases rapidly with increasing |t|. The data are in rough agreement with the prediction of a generalized Born term model. The resulting value for the pion electromagnetic form factor is Fπ = 0.42 ± 0.015.