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Low-energy antikaon-nucleon/nuclei interaction studies by AMADEUS

The AMADEUS experiment deals with the investigation of the low energy kaon–nuclei hadronic interaction at the DAΦNE collider at LNF-INFN, which is fundamental to solve longstanding questions in the nonperturbative strangeness QCD sector. AMADEUS step 0 consisted in the reanalysis of the 2004/2005 KLOE data, exploiting K^− absorptions in H, ^4He, ^9Be and ^{; ; ; 12}; ; ; C, leading to the first invariant mass spectroscopy study with very low-momentum (100 MeV) in-flight K^− captures. With AMADEUS step 1, a dedicated pure carbon target was implemented in the central region of the KLOE detector, providing a high statistic sample of pure at-rest K^− nuclear interaction. The results obtained in the analyses of the hyperon–pion correlated events, searching for the resonant shapes of Y states, will be described.

Chiral dynamics ; Bound state ; K^- absorption

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