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The analysis of the nine 1-fold differential cross sections for the$\gamma_{r,v} p \to \pi^+\pi^-p$ photo- and electroproduction reactionsobtained with the CLAS detector at Jefferson Laboratory was carried out withthe goal to establish the contributing resonances in the mass range from1.6~GeV to 1.8~GeV. In order to describe the photo- and electroproduction datawith $Q^2$-independent resonance masses and hadronic decay widths in the $Q^2$range below 1.5~GeV$^2$, it was found that an $N'(1720)3/2^+$ state is requiredin addition to the already well-established nucleon resonances. This workdemonstrates that the combined studies of $\pi^+\pi^-p$ photo- andelectroproduction data are vital for the observation of this resonance. Thecontributions from the $N'(1720)3/2^+$ state and the already established$N(1720)3/2^+$ state with a mass of 1.745~GeV are well separated by theirdifferent hadronic decays to the $\pi \Delta$ and $\rho p$ final states and thedifferent $Q^2$-evolution of their photo-/electroexcitation amplitudes. The$N'(1720)3/2^+$ state is the first recently established baryon resonance forwhich the results on the $Q^2$-evolution of the photo-/electrocouplings havebecome available. These results are important for the exploration of the natureof the ``missing'' baryon resonances.

Evidence for the $N'(1720)3/2^+$ Nucleon Resonance from Combined Studies of CLAS $\pi^+\pi^-p$ Photo- and Electroproduction Data