Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Hadron Structure and Spectroscopy V
HK 38.7: Vortrag
Donnerstag, 30. März 2017, 15:45–16:00, F 5
Determination of the 3 π0 photoproduction cross-section for Eγ∈ [1.42,1.58] GeV — •Martin Wolfes and Wolfgang Gradl for the A2 collaboration — Institut für Kernphysik, JGU Mainz, Germany
The A2 Collaboration uses an electron beam provided by the MAMI accelerator in Mainz to produce an energy tagged photon beam. Photon induced reactions are studied with the Crystal Ball/TAPS 4π calorimeter, which is optimized for neutral final states. Identification of charged particles is accomplished by an inner detector system.
In the course of the year 2014 this experimental setup was used to gather a large data sample of photon-proton reactions. Eg. the production of π0, ω, η or η′ mesons. This presentation will show the status of the ongoing analysis to determine cross-sections for triple π0 production. We will show how to get a precise value for the luminosity and how to identify the main background channels, namely the kinematically identical process of the η decaying to three π0 and the reaction γ p → Σ+ k0 with the k0 decaying to two neutral pions.