Eta(547) and Eta(958) Meson Photoproduction on the Proton
- Arizona State Univ., Mesa, AZ (United States)
Photoproduction of η and η' mesons has been studied at the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS) using a tagged photon beam incident on a hydrogen target with photon energies from the respective production thresholds up to 2.4 GeV. The photoproduced mesons were identified via missing mass reconstruction using recoil proton momentum and time of flight information. Data were obtained in a range of √s from threshold to 2.2 GeV for each meson. In this study, differential cross-section measurements for the γp →pη and γp → pη' reactions are presented, and the results compared to recent data. An isobar analysis of the differential cross-sections is performed. The predicted differential cross-sections from the isobar analysis are used to predict behavior in unmeasured regions of phase space, and to infer total cross sections. For the γp → pη reaction, a value of the S11(1535) proton helicity amplitude also was extracted and compared to recent analyses. The data presented greatly extends the energy and angle coverage for differential cross-sections of η photoproduction, and significantly improves the accuracy with which η' cross sections are known.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 824908
- Report Number(s):
- JLAB-PHY-01-65; DOE/ER/40150-2754; TRN: US0402244
- Resource Relation:
- Other Information: TH: Thesis (Ph.D.); Submitted to Arizona State Univ., Tempe, AZ (US); PBD: 1 Dec 2001
- Country of Publication:
- United States
- Language:
- English
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