Publications
Publication Information
| Title | First Measurement of Xi^- Polarization in Photoproduction |
| Authors | Jason Bono, Lei Guo, Brian Raue |
| JLAB number | JLAB-PHY-18-2743 |
| LANL number | arXiv:1804.04564 |
| Other number | DOE/OR/23177-4474 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physics Letters B Volume 783 Page(s) 280-286 Refereed | |
| Publication Abstract: | Despite decades of studies of the photoproduction of hyperons, both their production mechanisms and their spectra of excited states are still largely unknown. While the parity-violating weak decay of hyperons offers a means of measuring their polarization, which could help discern their production mechanisms and identify their excitation spectra, no such study has been possible for doubly strange baryons in photoproduction, due to low production cross sections. However, by making use of the reaction $\gamma p \to K^+ K^+ \Xi^-$, we have measured, for the first time, the induced polarization, $P$, and the transferred polarization from circularly polarized real photons, characterized by $C_x$ and $C_z$, to recoiling $\Xi^-$s. The data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab for photon energies from just over threshold (2.4 GeV) to 5.45 GeV. These first-time measurements are compared, and are shown to broadly agree, with model predictions in which cascade photoproduction proceeds through the decay of intermediate hyperon resonances that are produced via relativistic meson exchange, offering a new step forward in the understanding of the production and polarization of doubly-strange baryons. |
| Experiment Numbers: | |
| Group: | Hall B |
| Document: | |
| DOI: | https://doi.org/10.1016/j.physletb.2018.07.004 |
| Accepted Manuscript: | 1-s2.0-S0370269318305392-main.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |