First measurement of direct photoproduction of the a2(1320)0 meson on the proton
Journal Article
·
· Physical Review C
We present the first measurement of the reaction γp → a2(1320)0p in the photon energy range 3.5–5.5Ge V and four-momentum transfer squared 0.2 < –t < 2.0Ge V2. Data were collected with the CEBAF Large Acceptance Spectrometer detector at the Thomas Jefferson National Accelerator Facility. The a2 resonance was detected by measuring the reaction γp → π0ηp and reconstructing the π0η invariant mass. The most prominent feature of the differential cross section is a dip at –t ≈ 0.55GeV2. Here, this can be 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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Indiana Univ., Bloomington, IN (United States); George Washington Univ., Washington, DC (United States); Mississippi State Univ., Mississippi State, MS (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- The CLAS Collaboration
- Grant/Contract Number:
- AC05-06OR23177; AC02-06CH11357; FG02-87ER40365; SC0016583; FG02-07ER41528
- OSTI ID:
- 1670104
- Alternate ID(s):
- OSTI ID: 1669359; OSTI ID: 1726240; OSTI ID: 1781685; OSTI ID: 1839927
- Report Number(s):
- JLAB-PHY-20-3182; DOE/OR/23177-4959; arXiv:2004.05359; TRN: US2203830
- Journal Information:
- Physical Review C, Vol. 102, Issue 3; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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