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Recent JLab data of the differential cross section for the reactionp(e,e'p)pi0 in the invariant mass region of 1.1 < W < 1.4 GeV at four-momentumtransfer squared Q^2= 2.8 and 4.0 (GeV/c)$^2$ are analyzed with two models,both of which give an excellent description of most of the existing pionelectroproduction data below W < 1.5 GeV. We find that at up to Q^2 =4.0(GeV/c)^2, the extracted helicity amplitudes A_{3/2} and A_{/2} remaincomparable with each other, implying that hadronic helicity is not conserved atthis range of Q^2. The ratios E_{1+}/M_{1+} obtained show, starting from asmall and negative value at the real photon point, a clear tendency to crosszero, and to become positive with increasing Q^2. This is a possible indicationof a very slow approach toward the pQCD region.Furthermore, we find that thehelicity amplitude A_{1/2} and S_{1/2}, but not A_{3/2}, starts exhibiting thescaling behavior at about Q^2 \ge 2.5(GeV/c)^2.Comment: 4 pages LaTeX including 3 figures, paper replaced with some textual  changes and a new figur

physical review. c. nuclear physics/physical review. c, nuclear physics

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