München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Hadron Structure and Spectroscopy II
HK 10.7: Talk
Monday, March 18, 2019, 18:15–18:30, HS 13
Measurement of the beam-normal single-spin asymmetry for electrons scattered off 12C. — •Anselm Esser, Harald Merkel, Sören Schlimme, Concettina Sfienti, and Michaela Thiel — A1 Kollaboration, Inst. f. Kernphysik, Uni Mainz
The beam-normal single-spin asymmetry An arises in the elastic scattering of electrons polarised perpendicular to the scattering plane off unpolarised nuclei. It not only contributes as an important background to parity violation experiments, but has recently gained interest as a probe for multi photon exchange amplitudes. At the Mainz Microtron, An was measured for 570 MeV electrons scattered off 12C, covering the Q2 range between 0.02 and 0.05 GeV2/c2. Custom-build quartz Cherenkov detectors located in the focal plane of magnetic spectrometers were used for electron detection. The readout of the attached PMTs was performed with integrating ADCs allowing for particle rates too high for counting. The resulting asymmetry shows a significant deviation from the theoretical predictions in the covered Q2 range.