Heidelberg 2015 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Hadron Structure and Spectroscopy 1
HK 8.2: Talk
Monday, March 23, 2015, 15:00–15:15, T/SR19
Measurement of the Proton Scalar Polarizabilities at MAMI — •Vahe Sokhoyan for the A2 collaboration — Institut für Kernphysik, Universität Mainz
The scalar polarizabilities αE1 and βM1 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 and astrophysics. At the MAMI accelerator facility in Mainz, the proton polarizabilities were measured using a linearly polarized photon beam below pion photopoproduction threshold. The photons impinged on a liquid Hydrogen target and the reaction products were detected in the Crystal Ball and TAPS 4π spectrometer setup. The beam asymmetry Σ3 was measured for the first time below pion threshold. In this talk the results on the beam asymmetry Σ3, their significance and influence on the extraction of the scalar polarizabilities will be discussed.