München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Hadron Structure and Spectroscopy II
HK 10.1: Gruppenbericht
Montag, 18. März 2019, 16:30–17:00, HS 13
Measurement of the Proton Polarizabilities at MAMI — •Vahe Sokhoyan for the A2 collaboration — Universität Mainz, Institut für Kernphysik
Polarizabilities are fundamental properties related to the internal dynamics of the nucleon. They play a crucial role not only in our understanding of the nucleon, but also in other areas such as precision atomic physics. A program performed by the A2 Collaboration at the MAMI accelerator facility in Mainz aims for the first individual extraction of the nucleon scalar and spin polarizabilities using Compton scattering on the nucleons. The Crystal Ball and TAPS 4π spectrometer setup is used for the corresponding measurements. After the upgrade of the photon tagging system, a new high-statistics data set has been obtained for the determination of both unpolarized cross-section and beam asymmetry Σ3 below pion production threshold. This data set will allow us to extract the proton scalar polarizabilities with unprecedented precision. Moreover, for the extraction of the spin polarizabilities, the beam asymmetry Σ3 and the beam-target asymmetries Σ2x and Σ2z were measured at higher energies, where the sensitivity to the spin polarizabilities increases. In this talk, the current results and the plans for the upcoming measurements with the A2 setup at MAMI will be presented.