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We present the results on the ratios $E_{1+}^{(3/2)}/M_{1+}^{(3/2)}$ and$S_{1+}^{(3/2)}/M_{1+}^{(3/2)}$ for the $\gamma^* N \to \Delta(1232)$transition at $Q^2\leq 4 (GeV/c)^2$ extracted from the $p(e,e'p)\pi^0$ crosssection using two approaches: dispersion relations and modified version ofunitary isobar model. The obtained results are in good agreement with theresults of other analyses obtained using truncated multipole expansion at$Q^2=0.4,~0.525,~0.65,~0.75,~0.9,~1.15,~1.45,~1.8 (GeV/c)^2 $ and withindynamical and unitary isobar models at $Q^2=2.8,~4 (GeV/c)^2 $. According toobtained results the ratio $E_{1+}^{(3/2)}/M_{1+}^{(3/2)}$ remains small in allinvestigated region of $Q^2$ with very unclear tendency to cross zero above $2(GeV/c)^2$. The absolute value of the ratio $S_{1+}^{(3/2)}/M_{1+}^{(3/2)}$ isclearly increasing with increasing $Q^2$, while it should be a constant valuein the pQCD asymptotics. So, at $Q^2\leq4 (GeV/c)^2$ there is no evidence ofapproaching pQCD regime for these ratios. None of the soft approaches givessatisfactory description of the obtained results.Comment: 5 pages, 1 figure, invited talk at the Workshop on Exclusive  Processes at High Momentum Transfer, May 15-18, 2002, Jefferson La

Q2-EVOLUTION OF ΔNγ FORM FACTORS UP TO 4 (GEV/C)2 FROM JLAB DATA

Q²-EVOLUTION OF ΔN_γ FORM FACTORS UP TO 4 (GEV/C)² FROM JLAB DATA