Publications
Publication Information
| Title | First Results on Nucleon Resonance Electroexcitation Amplitudes from $ep\to e'\pi^+\pi^-p'$ Cross Sections at $W$ from 1.4-1.7 GeV and $Q^2$ from 2.0-5.0 GeV$^2$ |
| Authors | Victor Mokeev, Patrick Achenbach, Volker Burkert, Daniel Carman, Ralf Gothe, Astrid Hiller Blin, Evgeny Isupov, Kyungseon Joo, Krishna Neupane, Arjun Trivedi |
| JLAB number | JLAB-PHY-23-3865 |
| LANL number | (None) |
| Other number | DOE/OR/23177-6506 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physical Review C Volume 108 Page(s) 025204 | |
| Publication Abstract: | The electroexcitation amplitudes or $\gamma_vpN^*$ electrocouplings of the $N(1440)1/2^+$, $N(1520)3/2^-$, and $\Delta(1600)3/2^+$ resonances were obtained for the first time from the $ep \to e'\pi^+\pi^-p'$ 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 $Q^2$ from 2.0--5.0~GeV$^2$. A good description of the nine independent one-fold differential $\gamma_vp\to \pi^+\pi^-p'$ cross sections achieved within the data-driven JM meson-baryon reaction model in each bin of ($W$,$Q^2$) allows for separation of the resonant and non-resonant contributions. The electrocouplings were determined in independent fits of the $\pi^+\pi^-p$ 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 $Q^2$. The electrocouplings of the $\Delta(1600)3/2^+$, which decays preferentially into $\pi\pi N$ final states, have been determined for the first time. Consistent results on the electrocouplings of the $N(1440)1/2^+$ and $N(1520)3/2^-$ from the $\pi N$ and $\pi^+\pi^-p$ channels allows for the determination of the uncertainties related to the reaction models employed in the data fits. The reliable extraction of the electrocouplings for these states is also supported by the description of the $\pi^+\pi^-p$ differential cross sections with $Q^2$-independent masses and total/partial hadronic decay widths into the $\pi\Delta$ and $\rho p$ final states. 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. |
| Experiment Numbers: | E99-108 |
| Group: | Hall B |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevC.108.025204 |
| Accepted Manuscript: | |
| Supporting Documents: | |
| Supporting Datasets: | |