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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Hadronenstruktur und -spektroskopie

HK 30.7: Vortrag

Mittwoch, 21. März 2012, 18:15–18:30, RW 1

Search for ppK⁻ - Status of the FOPI p-p Experiment* — •Robert Münzer — Excellence Cluster Universe, TU München

The investigation of the kaon-nucleon interaction has been intensified in the last year due to new results on Λ(1405) (1) and indications on the existence of the ppK⁻ bound state (2). The possible creation of the ppK⁻ has been investigated at the FOPI spectrometer at GSI in proton-proton-collisions at 3.1 GeV. This reaction should favour the formation of the ppK⁻, according to some theoretical predictions (3).
Due to the RPC detector embedded in the FOPI spectrometer an excellent identification of K⁺ has been achieved for this data set. Additionally, a silicon detector system placed close to the target, has been constructed and employed to improve the vertex determination and used as an online trigger for the selection of Lambda hyperons. About 70 · 10⁶ events have been collected after the second level trigger selection.
This contribution will show the status of the ongoing analysis.
*supported by BMBF and Excellence Cluster Universe
(1) J. Siebenson, L. Fabbietti / in press.
(2) T. Yamazaki, M. Maggiora, P. Kienle / PRL 104 / 132502 (2010)
(3) T. Yamazaki, Y. Akaishi / PRC 76 / 045201 (2007)