Single photo and electroproduction of pions at EBAC@JLAB

الأصل · EN

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.