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Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.71: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Search for Symmetry Breaking Patterns with WASA-at-COSY — •Christian Pauly — Institut für Kernphysik and Jülich Center for Hadron Physics, D-52425 Jülich, Germany

Key issues of the WASA-at-COSY physics program are the study of symmetries and symmetry breaking patterns in low energy hadronic processes within the non-perturbative regime of QCD. High statistic measurements of η and η′ meson decays are used to search for violations of isospin symmetry, and to test conservation of fundamental C, P and CP symmetries. A precise measurement of charge symmetry breaking in the isospin violating process dd→α π0 is another important part of the physics program.

During the last year data have been obtained on several of the WASA key experiments. In particular, in fall 2008, a large data sample of ≥ 107 η-decays was produced in the reaction pd3He  η. The reaction allows for the tagging of the produced η mesons merely by identification of the 3He particle, covering all η decay channels. A second η production run on pppp  η focused on the study of η decays into charged particles, especially η → π+ π e+ e, which allows to search for an unconventional form of flavour conserving CP violation.

We present an overview of the experiment and status of the analysis.
— supported by BMBF, DAAD and Wallenberg Foundation

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