Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Hadron Structure and Spectroscopy III
HK 19.2: Gruppenbericht
Dienstag, 28. März 2017, 14:30–15:00, F 5
The A4 experiment at MAMI — •Luigi Capozza1,2, David Balaguer Ríos1, Sebastian Baunack1,3, Jürgen Diefenbach1, Boris Gläser1,2, Yoshio Imai1,2, Eva-Maria Kabuss1, Jeong-Han Lee1, Frank Maas1,2,3, Maria Carmen Mora Espí1,2, Ernst Schilling1, Dietrich von Harrach1, and Christoph Weinrich1 — 1Institut für Kernphysik, Johannes Gutenberg-Universität Mainz — 2Helmholtz-Institut Mainz — 3PRISMA Cluster of Excellence, Johannes Gutenberg-Universität Mainz
The A4 experiment at the MAMI accelerator facility at Mainz studies the nucleon structure by measuring beam single spin asymmetries in the electron-proton scattering. Longitudinal spin measurements, i.e. parity violating (PV), for accessing the strangeness contributions to the nucleon form factors, as well transverse spin measurements, sensitive to higher order QED corrections, have been performed on both hydrogen and deuterium targets at both forward and backward angles. A review of the experimental programme with emphasis on the recently published results and the ongoing data analysis activities will be given. The status of the latest attempt of extracting the PV asymmetry from inclusive single-pion electroproduction in the invariant mass range from threshold to the maximum of the Δ(1232) resonance will be reported.