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The nucleon resonance structure from exclusive $\pi^+\pi^-p$ photo-/electroproduction off protons
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abstract
The results on the photo- and electroexcitation amplitudes of most nucleon resonances in the mass range up to 2.0 GeV determined from the CLAS experimental data on exclusive $\pi^+\pi^-p$ photo-/electroproduction off protons in collaboration between the Jefferson Lab and Moscow State University are presented. The first and only available results on electroexcitation amplitudes from CLAS in a wide range of photon virtualities $Q^2$ $<$ 5.0 GeV$^2$ revealed the nucleon resonance structure as a complex interplay between the inner core of three dressed quarks and external meson-baryon cloud. These results shed light on the strong QCD dynamics which underlines the generation of excited nucleon states of different structural features from confined quarks and gluons. The future prospects of these studies in the new era of experiments with the CLAS12 detector, which started successfully in Spring of 2018, are outlined.
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Nucleon-to-Resonance Form Factors at Large Photon Virtualities
A quark-diquark Faddeev model with QCD-kindred momentum dependence reproduces high-Q2 nucleon-to-resonance transition form factors and predicts Delta(1600) electroproduction form factors of definite sign over 0<Q2<=6m_N^2.
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