Publications
Publication Information
| Title | Beam normal spin asymmetry for the $e p \to e Delta(1232)$ process |
| Authors | Carl Carlson, B. Pasquini, Vladiszlav Pauk, Marc Vanderhaeghen |
| JLAB number | JLAB-THY-17-2630 |
| LANL number | arXiv:1708.05316 |
| Other number | DOE/OR/23177-4301 |
| 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 D Volume 96 Page(s) 113010 Refereed | |
| Publication Abstract: | We calculate the single spin asymmetry for the $e p \to e \Delta(1232)$ process, for an electron beam polarized normal to the scattering plane. Such single spin asymmetries vanish in the one-photon exchange approximation, and are directly proportional to the absorptive part of a two-photon exchange amplitude. As the intermediate state in such two-photon exchange process is on its mass shell, the asymmetry allows one to access for the first time the on-shell $\Delta \to \Delta$ as well as $N^\ast \to \Delta$ electromagnetic transitions. We present the general formalism to describe the $e p \to e \Delta$ beam normal spin asymmetry, and provide a numerical estimate of its value using the nucleon, $\Delta(1232)$, $S_{11}(1535)$, and $D_{13}(1520)$ intermediate states. We compare our results with the first data from the Qweak@JLab experiment and give predictions for the A4@MAMI experiment. |
| Experiment Numbers: | other |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevD.96.113010 |
| Accepted Manuscript: | JLAB-THY-17-2630.pdf embargoed final, peer reviewed, accepted manuscript |
| Supporting Documents: | |
| Supporting Datasets: | |