2023/06/23 by V. I. Mokeev, Mokeev, V. I., P. Achenbach +17
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2306.13777
openalex publication_date 2023/06/23 · openalex created_date 2023/06/28 · openalex updated_date 2026/07/28
The electroexcitation amplitudes or γvpN^* electrocouplings of the N(1440)1/2+, N(1520)3/2-, and Δ(1600)3/2+ resonances were obtained for the first time from the ep → e'π+π-p' differential cross sections measured with the CLAS detector at Jefferson Lab within the range of invariant mass W of the final state hadrons from 1.4--1.7 GeV for photon virtualities Q2 from 2.0--5.0 GeV2. The electrocouplings were determined in independent fits of the π+π-p cross sections within three overlapping W intervals with a substantial contribution from each of the three resonances listed above. Consistent results on the electrocouplings extracted from the data in these W intervals provide evidence for their reliable extraction. These studies extend information on the electrocouplings of the N(1440)1/2+ and N(1520)3/2- available from this channel over a broader range of Q2. The electrocouplings of the Δ(1600)3/2+, which decays preferentially into ππN final states, have been determined for the first time. Our results provide further evidence for the structure of these resonances in terms of an interplay between the inner core of three dressed quarks and an external meson-baryon cloud.