Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Hadron Structure and Spectroscopy V

HK 38.8: Talk

Thursday, March 30, 2017, 16:00–16:15, F 5

Photoproduction of neutral pion pairs and triplets of deuteron — •Michael Sven Günther for the A2 collaboration — Departement Physik, Universität Basel, Basel, Schweiz

Photoproduction of multiple-meson final states is an efficient tool for the study of sequential decays of nucleon resonances, i.e. decays involving intermediate excited states. When pions are involved in the decay the isospin degree of freedom is important. Apart from quasi-free production reactions off neutrons bound in light nuclei, such as the deuteron, coherent production mechanisms off light nuclei may serve as an isospin filter. So far, such reactions have almost not been explored due to the small production cross sections and the background from quasi-free processes. Here we summarize preliminary results for the coherent photoproduction of Pi0 pairs and Pi0 triples off deuterium nuclei. Coherent photoproduction of Pi0 pairs has gained a lot of interest because this is a possible production channel for the much discussed d*(2380) di-baryon resonance. Coherent photoproduction of Pi0 triples offers an elegant way to study three-pion production processes in an energy range where in free and quasi-free processes this final state is completely dominated by the 3-Pi0 decay of the eta meson. The experiments were done at the tagged photon beam of the Mainz MAMI accelerator using a liquid deuterium target and the combined Crystal Ball/TAPS electromagnetic calorimeter.