München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Hadron Structure and Spectroscopy II
HK 10.4: Talk
Monday, March 18, 2019, 17:30–17:45, HS 13
Measurement of the transverse beam spin asymmetry in elastic electron proton scattering at A4 — D. Balaguer Ríos1, S. Baunack1,3, L. Capozza1, J. Diefenbach1,2, B. Gläser1,2, •B. Gou2, Y. Imai1,2, E.-M. Kabuss1, J.H. Lee1, F. Maas1,2,3, M. C. Mora Espí1,2, E. Schilling1, D. von Harrach1, and C. Weinrich1 for the A4 collaboration — 1Institut für Kernphysik, Johannes Gutenberg-Universität Mainz — 2Helmholtz-Institut Mainz — 3PRISMA Cluster of Excellence, Johannes Gutenberg-Universität Mainz
The study of the two-photon exchange is motivated by the discrepancy between the Rosenbluth separation and polarization transfer data on the proton form factor ratio. In order to extract the hadron-structure information correctly in the high-precision electron scattering experiments, one needs to understand how the two-photon exchange may affect various observables. The transverse single spin asymmetries, which arise due to the interference between the one-photon and two-photon exchange amplitudes, provide an excellent opportunity to test our understanding of the two-photon exchange mechanism. The A4 collaboration at the MAMI accelerator has performed measurements on the transverse beam spin asymmetry at various beam energies between 300 MeV and 1.5 GeV. The latest results will be presented in this talk.