Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 65: Hadronenstruktur und -spektroskopie XI

HK 65.3: Talk

Friday, March 19, 2010, 14:45–15:00, HG IV

Measurement of Hyperon Decays of Charmonia with the BES3 Detector^* — •Björn Spruck, Ingo Heller, Jens Sören Lange, Yutie Liang, Wolfgang Kühn, and Qiang Wang — II. Physikalisches Institut, Universität Gießen

Since 2009, the upgraded BES3 detector located at IHEP/Beijing has taken over 200M J/Ψ and over 100M Ψ(2S) events in symmetric e⁺e⁻ collisions at the resonance energies. This data is so far the largest amount of electron collider data on charmonia and gives the opportunity to study know decays more precisely and discover new decay channels. This talk will be focused on baryon/anti-baryon decays involving hyperons (Λ, Σ, Ξ and their excited states). For some of these decays a large SU(3) flavour symmetry breaking has been observed by other experiments before. The design of the BES3 detector allows for exclusive reconstruction of these decays into charged and neutral channels. Possible implications for measurements at the PANDA experiment will be discussed and preliminary results on inclusive and exclusive reconstructions will be presented.
^* This work was supported by WTZ-CHN(06-20).