Dynamical study of $\gamma^*N \leftrightarrow \Delta$ transition with   $N(e,e'p)\pi$
  The Dubna-Mainz-Taipei (DMT) dynamical model for pion electromagnetic production, which describe well the existing data from threshold up to 1 GeV photon lab energy is presented and used to analyze recent data in the $\Delta$ region . We find that within DMT model, the bare $\Delta$ is almost spherical while the physical $\Delta$ is oblate. The deformation is almost saturated by the pion cloud effects. 
S. N. Yang (Department of Physics, NTU, Taipei, Taiwan), S. S. Kamalov   (Laboratory of Theoretical Physics, JINR, Dubna, Ru...