E2/M1ratio of theΔ↔γNtransition within the chiral constituent quark model

The chiral constituent quark model is applied to predict the magnetic $M1\mathrm{}$ and electric $E2\mathrm{}$ amplitudes of the $\Delta \leftrightarrow \gamma N$ transition. It is found that the one-meson-exchange quark-quark potential due to the chiral fields enhances the $E2/M1\mathrm{}$ ratio by a factor of about 2. The predicted $M_{1^{+}}$ amplitude and the $E2/M1\mathrm{}$ ratio $\simeq -1.0\%$ are within the range determined from a recent analysis of the data of pion photoproduction.