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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Hadron Structure and Spectroscopy II
HK 9.6: Vortrag
Montag, 14. März 2016, 18:00–18:15, S1/01 A5
Parity violation asymmetry in the inelastic electron-proton scattering at the A4 experiment — •Luigi Capozza1,2, David Balaguer Ríos2, Sebastian Baunack2,3, Jürgen Diefenbach2, Boris Gläser1,2, Yoshio Imai2, Eva-Maria Kabuss2, Jeong-Han Lee2, Frank Maas1,2,3, Maria Carmen Mora Espí1,2, Ernst Schilling2, Dietrich von Harrach2, and Christoph Weinrich2 — 1Helmholtz-Institut Mainz — 2Institut für Kernphysik, Johannes Gutenberg-Universität 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 single spin asymmetries in the electron-proton scattering. The apparatus was designed for measuring asymmetries in the elastic scattering, separating elastic and inelastic events by measuring the energy of the scattered particles in an homogeneous PbF2 electromagnetic calorimeter. However, also inelastic events have been recorded during the measurements and contain threshold pion production and Δ(1232) resonance excitation. In order to extract parity violation asymmetries from these data, background contributions to the energy spectrum need to be estimated in MC simulations. An update of the A4 MC containing the contribution of π0 decay gammas from double-pion production will be presented.