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Publication Information
Title First measurement of direct photoproduction of the $a_2(1320)^0$ meson on the proton
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.
Author(s) Andrea Celentano, Vincent Mathieu, Alessandro Pilloni, Adam Szczepaniak
Publication Date September 2020
Document Type Journal Article
Primary Institution Thomas Jefferson National Accelerator Facility, Newport News
Affiliation Exp Nuclear Physics / Experimental Halls / Hall B
Funding Source Nuclear Physics (NP)
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-20-3182 OSTI Number: 1670104
LANL Number: arXiv:2004.05359 Other Number: DOE/OR/23177-4959
Associated with an experiment Yes
Experiment Number(s)
E04-005
E04-017
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Journal Article
Journal Name Physical Review C
Refereed Yes
Volume 102
Issue
Page(s) 032201(R)
Attachments/Datasets/DOI Link
Document(s)
2004.05359.pdf (STI Document)
2004.05359.pdf (Accepted Manuscript)
DOI Link
Dataset(s) (none)
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