N Delta - Transition Form Factors at Low Momentum Transfer

Abstract

The three complex form factors entering the $\Delta \to N{\gamma }^{\ast }$ vertex are calculated to $\mathcal{O}({ϵ}^3)$ in the framework of a chiral effective theory with explicit $\Delta$(1232) degrees of freedom. Furthermore, the role of presently unknown low energy constants that affect the values of EMR and CMR is elucidated.

Comments: 5 pages, 3 figures, Oral contribution given at the 8th International Conference on the Structure of Baryons (Baryons '98), Bonn, Germany, Sept. 22-26, 1998