Faculty of Physics
M.V.Lomonosov Moscow State University
Regular Article

# The nucleon resonance structure from exclusive $\pi^+\pi^-p$ photo-/electroproduction off protons

## V. D. Burkert$^1$, V. I. Mokeev$^1$, B. S. Ishkhanov$^2$

### Moscow University Physics Bulletin 2019. N 3.

• Article
Annotation

The results on 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.

Approved: 2019 August 26
PACS:
11.55.Fv Dispersion relations
13.40.Gp Electromagnetic form factors
13.60.Le Meson production
14.20.Gk Baryon resonances
Rissian citation:
В. Д. Буркерт, В. И. Мокеев, Б. С. Ишханов.
Вестн. Моск. ун-та. Сер. 3. Физ. Астрон. 2019. № 3. С. 28.
Authors
V. D. Burkert$^1$, V. I. Mokeev$^1$, B. S. Ishkhanov$^2$
$^1$Thomas Jefferson National Accelerator facility
$^2$Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University

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