Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Hadron Structure and Spectroscopy 8

HK 38.2: Group Report

Tuesday, March 24, 2015, 17:30–18:00, T/SR25

Studies of η^′ (ω) mesons with the Crystal Ball/TAPS setup at MAMI — •Patrik Adlarson for the A2 collaboration — Institut für Kernphysik, Johannes Gutenberg Universität, Mainz, Germany

Precision studies of light meson decays are used to investigate a wide range of topics related to fundamental aspects of hadron physics. In particular, η^′ decays allow for tests of such diverse topics as ππ scattering lengths, the SU(3) singlet-octet mixing angle, quark mass differences and light-by-light contribution to the anomalous magnetic moment of the muon. Recently, a large statistics sample of η^′ (ω) mesons have been produced and collected with the Crystal Ball/TAPS setup at MAMI. An overview of the physics motivation, the experimental setup and preliminary results from the ongoing analyses are presented.