Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 34: Hadron Structure and Spectroscopy I
HK 34.9: Talk
Tuesday, March 17, 2009, 18:45–19:00, H-ZO 20
η → π+ π− π0 decay with WASA-at-COSY — •Patrik Adlarson — Department of Physics and Astronomy, Uppsala University, SE-751 21 Uppsala, Sweden
In the fall of 2008 a four week experiment was carried out with WASA-at-COSY with the purpose of studying η-
decays. The ηs were produced in the pd→ 3He η reaction at beam kinetic energy 1 GeV
and in total approximately 107 of such events were collected. This data will be used to study the not so rare η decays
involving charged pions, most notably η → π+ π− π0. This decay proceeds
mainly via a strong isospin violating contribution, where the decay width is proportional to the quark mass
difference squared, (md−mu)2. Preliminary results of the analysis are presented.
Supported by BMBF, Wallenberg Foundation and Uddeholms Forskarstipendium.