Dynamical Coupled-channel analysis of pion electroproduction data in the $W \leq 2 $ GeV resonance region

Within a dynamical coupled-channel model developed recently at EBAC, we have analyzed single pion electroproduction data from CLAS. The channels included are $\gamma N$, $\pi N$, $eta N$ and $\pi\pi N$ which has $\pi\Delta$, $\rho N$, and $\sigma N$ resonant components. The hadronic parameters of the model have been determined from fitting the $\pi N$ scattering data up to $W=2$ GeV. The determined $\gamma^* N \rightarrow N^*$ form factors for all low-lying $N^*$ states will be presented. The relations with the analysis based on the unitary isobar models will be discussed.