A Dynamical Model for the Resonant Multipoles and the ∆ Structure


We show that recent experiment data for the ratios E1+/M1+ and S1+/M1+ can be explained in a dynamical model for electromagnetic production of pions, together with a simple scaling assumption for the bare γN∆ form factors. Within our model we find that the bare ∆ is almost spherical and the electric E2 and Coulomb C2 quadrupole excitations of the physical… (More)


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