EPJ Web Conf.
Volume 241, 2020The 12th International Workshop on the Physics of Excited Nucleons (NSTAR 2019)
|Number of page(s)||9|
|Published online||22 September 2020|
Two Pion Photo- and Electroproduction with CLAS
for the CLAS Collaboration1 - Jefferson Laboratory, 12000 Jefferson Ave., Newport News , 23606, USA
* e-mail: email@example.com
Published online: 22 September 2020
Exclusive π+π-p photo- and electroproduction data from CLAS have considerably extended the information on the spectrum and structure of nucleon resonances. The data from the π+π-p and Nπ channels have provided results on the electrocouplings of most resonances in the mass region up to 1.8 GeV and at photon virtualities up to 5.0 GeV2. The recent CLAS data on π+π-p photoproduction have improved knowledge on the photocouplings of nucleon resonances in the mass range of 1.6 GeV < MN* < 2.0 GeV and on their decays to the πΔ and ρp final hadron states. Analyses of the combined π+π-p photo- and electroproduction data have revealed evidence for the candidate-state N’(1720)3/2+. The new results on the nucleon resonance spectrum, electroexcitation amplitudes from analysis of the CLAS π+π-p photo- and electroproduction data, and their impact on the exploration of strong QCD are presented.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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