2022 •
"dcs12_20" of "Helicity-dependent cross sections and double-polarization observable E in eta photoproduction from quasi-free protons and neutrons"
Authors:
A2 Collaboration
Abstract:
A2 Collaboration at MAMI. Precise helicity-dependent cross sections and the double-polarization observable E were measured for $\eta$ photoproduction from quasifree protons and neutrons bound in the deuteron. The $2\gamma$ and $3\pi^0$ decay modes were used to optimize the statistical quality of the data and to estimate systematic uncertainties. The measurement used the A2 detector setup at the tagged photon beam of the electron accelerator MAMI in Mainz. A longitudinally polarized deuterated butanol target was used in combination with a circul (...)
A2 Collaboration at MAMI. Precise helicity-dependent cross sections and the double-polarization observable E were measured for $\eta$ photoproduction from quasifree protons and neutrons bound in the deuteron. The $2\gamma$ and $3\pi^0$ decay modes were used to optimize the statistical quality of the data and to estimate systematic uncertainties. The measurement used the A2 detector setup at the tagged photon beam of the electron accelerator MAMI in Mainz. A longitudinally polarized deuterated butanol target was used in combination with a circularly polarized photon beam from bremsstrahlung of a longitudinally polarized electron beam. The reaction products were detected with the electromagnetic calorimeters Crystal Ball and TAPS, which covered 98% of the full solid angle. The main systematic uncertainty of the E asymmetry is related to the measurement of the beam and target polarizations. The uncertainty of the photon polarization degree was determined to be ±2.7%. The uncertainty of the target polarization was estimated as ±10%. (Read More)
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