Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy VIII

HK 47.4: Talk

Thursday, March 17, 2016, 15:00–15:15, S1/01 A5

Measurement of the relative branching fraction of η′ → π⁰ π⁰ π⁰ — •Martin Wolfes und Wolfgang Gradl für die A2 Kollaboration — Institut für Kernphysik Universität Mainz, Mainz, Rheinland-Pfalz

The A2 Collaboration uses an electron beam provided be 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 photo-produced η′ and ω mesons off a hydrogen nuclei. This dataset is used to determine various branching fractions.

In this talk the ongoing work on the analysis of the isospin-violating decay of η′ to three neutral pions is presented. We will also present an addon for the PLUTO event generator, which produces a cocktail of photo-production data for a given energy distribution.