Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Hadron Structure and Spectroscopy V
HK 38.3: Talk
Thursday, March 30, 2017, 14:45–15:00, F 5
Measurement of π0π± Photoproduction off the Deuteron with the A2 Experiment — •Sebastian Lutterer for the A2 collaboration — Departement Physik, Universität Basel
Photoproduction of pion pairs off (quasi-) free nucleons is important to investigate the excitation spectrum of the nucleon for low energy QCD, in particular for excited states which decay predominantly via intermediate excited states to the ground state. Quasi-free production of such pairs off heavier nuclei also figures prominently in the study of the in-medium properties of nucleon resonances. Double meson production channels make the largest contribution to the second resonance bump of the nucleon which disappears for photoproduction off nucleons bound in nuclei. The special interest in the mixed charged channels π0π± is related to the contribution of the ρ-meson. This decay is forbidden for the π0π0 final state due to isospin conservation. The coupling to a ρ could induce substantial in-medium effects when the ρ spectral function itself is modified in the medium. In the present work production of π0π± pairs off liquid deuterium is analysed using data taken at MAMI with the A2 experiment as a starting point for a detailed investigation of this channel for nuclear targets. Data for a 4He target have also already been taken.