Measurement of the gp-->etaP reaction with Crystal Ball detector at the Mainz Microtron (MAMI-C)
Abstract
The gp-->etaP reaction has been measured with the Crystal Ball multiphoton spectrometer and TAPS calorimeter in the energy range from the production threshold of 707 to 1400 MeV. Bremsstrahlung photons produced by the 1.5 GeV electron beam of the Mainz Microtron MAMI-C and tagged by the Glasgow photon spectrometer were used for the eta-meson production. The available statistics of 3.8 x 10^6 gp-->etaP-->3pi0P-->6gP events allowed to study in detail the reaction dynamics at our energies. The gp-->etaP differential cross sections were determined for the full range of the production angles by dividing the data in 120 energy intervals. The systematic uncertainties in the differential cross sections are at the order of 4%. The data have been used to evaluate the etaP multipoles in the vicinity of several low-lying I = 1/2 baryon resonances. These data and the extracted multipoles are compared to previous determinations.
- Publication:
-
APS Meeting Abstracts
- Pub Date:
- October 2009
- Bibcode:
- 2009APS..HAW.CF005S