THRESHOLD PI-0 ELECTROPRODUCTION ON HYDROGEN AT K-(2)=0.88(GEV-C)2

We have measured pπ0 electroproduction at −k2 = 0.88 (GeV/c)2 near threshold. Comparison with models shows that a ‘weak PCAC’ model, a fixed-t dispersion relation model and a pseudo-vector-Born approximation all adequately describe the small threshold cross section. Away from threshold the cross section dependence suggests that the pseudo-vector-Born approximation is not adequate.