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Title: Updates on the Studies of $${\varvec{N}}^\mathbf{*}$$ N * Structure with CLAS and the Prospects with CLAS12

Here, the recent results on $$\gamma_vpN^*$$ electrocouplings from analyses of the data on exclusive meson electroproduction off protons measured with the CLAS detector at Jefferson Lab are presented. The impact of these results on the exploration of the excited nucleon state structure and non-perturbative strong interaction dynamics behind its formation is outlined. The future extension of these studies in the experiments with the CLAS12 detector in the upgraded Hall-B at JLab will provide for the first time $$\gamma_vpN^*$$ electrocouplings of all prominent resonances at the still unexplored distance scales that correspond to extremely low (0.05~GeV$^2 < Q^2 <$ 0.5~GeV$^2$) and the highest photon virtualities (5.0~GeV$^2 < Q^2 <$ 12.0~GeV$^2$) ever achieved in the exclusive electroproduction measurements. The expected results will address the most important open problems of the Standard Model: on the nature of more than 98\% of hadron mass, quark-gluon confinement and emergence of the excited nucleon state structure from the QCD Lagrangian, as well as allowing a search for the new states of hadron matter predicted from the first principles of QCD, the so-called hybrid baryons.
Publication Date:
Report Number(s):
JLAB-PHY-16-2218; DOE/OR/23177-3675
Journal ID: ISSN 0177-7963; PII: 1127
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Few-Body Systems
Additional Journal Information:
Journal Name: Few-Body Systems; Journal ID: ISSN 0177-7963
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; exclusive meson electroproduction; nucleon resonance structure; non-perturbative strong interaction
OSTI Identifier: