Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 67: Hadron Structure and Spectroscopy 12

HK 67.5: Talk

Thursday, March 26, 2015, 18:15–18:30, T/SR25

Probing the existence of the Kaonic Nuclear Cluster "ppK⁻" with help of a PWA — •Eliane Epple for the HADES collaboration — Physik Dept. E12, Technische Universität München, Garching — Excellence Cluster "Universe", 85748 Garching

The "ppK⁻" is a well established state in theory and is a candidate for a new kind of hadronic matter formed by antikaons and nucleons. The HADES spectrometer at GSI has probed the existence of such a state by measuring its possible decay products p and Λ. These decay products have been studied specifically in the reaction p+p → p+ K⁺ + Λ at a beam kinetic energy of 3.5 GeV. A partial wave analysis, performed on this final state, helped in describing the event distributions, which is a necessary condition to search for an additional small signal in the statistic. We have found no indication for the production of a kaonic nuclear bound state in our data and have, thus, set an upper limit for its production cross section.

Furthermore, did we repeat the analysis of the DISTO collaboration in which a signal like distribution appeared in so-called deviation spectra. We can show that this method is error-prone in terms of the applied selection cuts and is, thus, not reliable in order to make statements about the "ppK⁻".
*supported by: BMBF(05P12WOGHH) and the Excellence Cluster ’Universe’