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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Hadron Structure and Spectroscopy II

HK 10.4: Vortrag

Montag, 18. März 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. Baunack^1,3, L. Capozza¹, J. Diefenbach^1,2, B. Gläser^1,2, •B. Gou², Y. Imai^1,2, E.-M. Kabuss¹, J.H. Lee¹, F. Maas^1,2,3, M. C. Mora Espí^1,2, 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.