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We present parametrizations of the $\gamma^\ast N \to N(1535)1/2^-$,$\gamma^\ast N \to N(1520)3/2^-$ and $\gamma^\ast N \to \Delta(1232)3/2^+$transition amplitudes that are compatible with the analytic constraints at thepseudothreshold (Siegert's theorem). The presented parametrizations alsoprovide a fair description of the experimental data. For the case of the$\gamma^\ast N \to \Delta(1232)3/2^+$ transition, we discuss how the pion cloudparametrizations of the electric and the Coulomb quadrupole form factors can beadjusted according to the Siegert's theorem.

Empirical parametrizations of the resonance amplitudes based on the Siegert's theorem