Single photo and electroproduction of pions at

Abstract: 

Within the Excited Baryon Analysis Center we have performed a dynamical coupled-channels analysis of the available p(e,e' π)N data in the region of W≤ 1.6 GeV and Q²≤1.45 (GeV/c)². The channels included are γ^*N, πN, ηN, and ππN which has πΔ, ρN, and σN components. With the hadronic parameters of the model determined in our previous investigations of πN→πN reaction, we have found that the available data in the considered W≤1.6 GeV region can be fitted well by only adjusting the bare γ^*N→N^* helicity amplitudes for the lowest N^* states in P₃₃, P₁₁, S₁₁ and D₁₃ partial waves. The meson cloud effect, as required by the unitarity conditions, on the γ^*N→N^* form factors are examined.