Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 14: Hadron Structure and Spectroscopy II

HK 14.8: Talk

Monday, March 16, 2009, 18:45–19:00, H-ZO 30

Polarised Strangeness Photoproduction at CBELSA-TAPS — •Ralf Ewald — Physikalisches Institut, Universität Bonn

Albeit quark models explain the known baryon spectrum reasonably well, they all overpredict the number of states significantly. This is normally called the *missing resonance* problem. A possible solution may be, that these resonances remained undetected in π-induced reactions, but have a sizeable coupling to decay channels with strangeness involved. Therefore associated Kaon-Hyperon photoproduction is investigated at ELSA.
Data were taken using the combined photon spectrometers Crystal Barrel and TAPS and polarised photonbeam with energies up to 2.9 GeV. This setup was well suited to detect multi photon final states and was therefore ideal to measure the reaction channel γ p → Σ⁺K_s⁰→ p π⁰π⁰π⁰ → p 6γ. This talk deals with the present status of my analysis of this reaction and preliminary results for cross sections and the polarisation observables Σ and P.
* sponsored by the DFG(SFB/TR 16)