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Studies of the Decay η→π+π-π0 with WASA-at-COSY
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. (WASA-at-COSY)
2012 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

In 2008 a large statistics sample of approximately 1·107 η-decays has been collected with the WASA detector at COSY using the pd→3Heη reaction at the beam kinetic energy of 1 GeV. These data are being used to study the not so rare η decays involving charged pions, like η→π+π-π0. This decay proceeds mainly via a strong isospin violating contribution, where the decay width is proportional to the light quark mass difference squared, (md-mu)2. In addition this decay can be used to search for C-violating effects. The analysis is presented and the Dalitz plot parameters with statistical and systematical uncertainties are determined from a sample of 1.33·105 η→π+π-π0 events in the Dalitz plot. The asymmetry parameters with statistical uncertainties are presented which show no evidence of C-violation.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. , 160 p.
Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-2516 ; 100
Keyword [en]
Hadron physics, Chiral Perturbation Theory, Isospin violation, Quark masses, Symmetries, Advanced Instrumentation
National Category
Subatomic Physics
Research subject
Nuclear Physics
URN: urn:nbn:se:uu:diva-181236ISBN: 978-91-554-8476-7OAI: diva2:555484
Public defence
2012-11-02, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
EU, FP7, Seventh Framework ProgrammeKnut and Alice Wallenberg Foundation
Available from: 2012-10-12 Created: 2012-09-20 Last updated: 2013-04-02

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