The idea of AMADEUS is to make use of the KLOE detector at DAΦNE with specific components added, like a cryogenic gas target for stopping the charged kaons and an inner detector system. It will perform, for the first time, a systematic and complete spectroscopic study of kaon nucleon interaction at low energy; we will especially look for antikaon-mediated bound nuclear states. By measuring all particles in the formation and in the decay processes of two- and three-baryon states with strangeness S = –1 a kinematically complete study will be performed.

A special work started already in 2007 to analyse part of the existing KLOE data, which was continued to 2008, with the main objectives to search for events with the signature of kaon‐nucleon‐clusters for kaons stopped in the thin gas of the drift chamber (room temperature, atmospheric pressure). Therefore, one main project of the analysis was the reconstruction of Lambda particles in the He‐isobutane gas mixture of the drift chamber, because Lambda particles are one of the main decay products of tri-baryon states with strangeness. In addition the knowledge gained during this analysis, namely of reconstruction and detector efficiencies and techniques of particle identification, especially for protons (and deuterons), are essential for the design of the AMADEUS experiment.

 

Outlook

The successful analysis of the KLOE data to look for antikaon‐mediated deeply bound nuclear clusters is going on and publishable results are expected for 2009. The working group to study the inter‐changeability between the KLOE and AMADEUS setup, with the involvement of the DAΦNE machine group, will continue their work.

An agreement has been worked out to regulate the work for the maintenance and upgrade of the KLOE detector between KLOE and the AMADEUS collaboration, which will be signed beginning of 2009