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HK: Fachverband Hadronen und Kerne
HK 13: Hadron Structure and Spectroscopy I
HK 13.4: Talk
Monday, March 16, 2009, 17:15–17:30, H-ZO 20
Analysis of the pp → Λ p K+ Reaction at Tp = 2.26 GeV * — •Katharina Ehrhardt, Heinz Clement, Evgueny Doroshkevich, Arthur Erhardt, and Gerhard J. Wagner — Physikalisches Institut der Universität Tübingen
Our effort to contribute to the pentaquark search [1] with a precision measurement resulted also in a high-statistics measurement of the pp → Λ p K+ reaction at Tp = 2.26 GeV as a by-product. In the two-particle invariant masses these data cover the kinematical ranges of N* → Λ K+ decays including the P11(1710) resonance decay. Our analysis focusses on structures in the Dalitz plots, which would be indicative of the excitation of strange and non-strange baryon resonances decaying into p K+ and Λ K+ channels, respectively as well as of possible dibaryon resonances in the Λ p system. With regard to the latter we also investigate the K+ missing mass spectrum for possible signals of a Λ p π0 resonance and a ppK− bound system discussed in connection with recent FINUDA results.
First results of the analysis will be presented.
[1] M. Abdel-Bary et al., Phys.Lett. B 649 (2007) 252
* supported by BMBF, COSY-FFE, DFG (Eur. Graduate School)