New results in the studies of the high-lying nucleon resonances from the CLAS data on $\pi^+\pi^-p$ electroproduction

The exclusive double-pion electroproduction represents the primary source of information on the structure of excited proton states in the mass region $M_{N^*}$ $>$ 1.6 GeV. Preliminary results on electrocouplings and $\pi \Delta$ and $\rho p$ hadronic decays of prominent $N^*$ states in this mass range will be presented. They were obtained from the analysis of CLAS data on $\pi^+\pi^-p$ electroproduction at photon virtualities 0.5$<$Q$^2$$<$1.5 GeV$^2$ [1] within the framework of the reaction model [2]. Our results confirmed the electrocouplings of N(1680)5/2$^+$ resonance determined in the studies of $N\pi$ exclusive channels [3]. The electrocouplings of $\Delta$(1620)1/2$^-$, $\Delta$(1700)3/2$^-$, and N(1720)3/2$^+$ resonances were determined for the first time from analysis of $\pi^+\pi^-p$ electroproduction with good accuracy. The results on electrocouplings of proton states in the mass range up to 1.8 GeV provide stringent constraints for the development of QCD-based approaches aimed at describing the complex structure of excited nucleon states. \\[4pt] [1] M.Ripani et al., CLAS Collaboration, Phys. Rev. Lett. 91, 022002 (2003).\\[0pt] [2] V.I.Mokeev et al., Phys. Rev. C80, 045212 (2009).\\[0pt] [3] L.Tiator et al., Eur. Phys. J. ST198, 141 (2011).