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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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