Publications
Publication Information
| Title | First measurement of direct photoproduction of the $a_2(1320)^0$ meson on the proton |
| Authors | Andrea Celentano, Vincent Mathieu, Alessandro Pilloni, Adam Szczepaniak |
| JLAB number | JLAB-PHY-20-3182 |
| LANL number | arXiv:2004.05359 |
| Other number | DOE/OR/23177-4959 |
| 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 102 Page(s) 032201(R) Refereed | |
| Publication Abstract: | We present the first measurement of the exclusive reaction $\gamma p \rightarrow a_2(1320)^0 \, p$ in the photon energy range $3.5$-$5.5$ GeV and four-momentum transfer squared $0.2<-t<2.0$ GeV$^2$. Data were collected with the CEBAF Large Acceptance Spectrometer at the Thomas Jefferson National Accelerator Facility. The neutral $a_2$ resonance was detected by measuring the reaction $\gamma p \rightarrow \pi^0 \eta p$ and reconstructing the $\pi^0 \eta$ invariant mass. The differential cross section $d\sigma/dt$ was extracted at different beam energies in each $-t$ bin. The most prominent feature of the differential cross section is a dip at $-t\simeq 0.55$ GeV$^2$. This can be well described in the framework of Regge phenomenology, where the exchange degeneracy hypothesis predicts a zero in the reaction amplitude for this value of the four-momentum transfer. |
| Experiment Numbers: | E04-005, E04-017 |
| Group: | Hall B |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevC.102.032201 |
| Accepted Manuscript: | 2004.05359.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |