Speaker
Description
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. So far coherent 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 $\pi^0$ pairs and $\pi^0$ triples off deuterium nuclei.
Coherent photoproduction of $\pi^0$ pairs has gained a lot of interest because
this is a possible production channel for the much discussed $d^{\star}(2380)$
di-baryon resonance.
The experiments were done at the MAMI accelerator using a liquid deuterium target and the combined Crystal Ball/TAPS electromagnetic calorimeter.
