Abstract
The AMADEUS experiment aims to provide unique quality data for K − interaction with nucleons and light nuclei, both at-rest and in-flight (for K − momenta of about 100 MeV). The goal is to solve longstanding open issues in the non-perturbative QCD in the strangeness sector, like the nature of the Λ(1405) state, the resonant versus non-resonant yield in nuclear K − capture and the properties of kaonic nuclear clusters which are strongly related to the multi-nucleon absorption processes. We can take advantage of the DA ΦNE collider representing a unique source of monochromatic low-momentum kaons, whose nuclear interaction with the materials of the KLOE detector (used as an active target) furnish us excellent acceptance and resolution data for K − capture on H, 4He, 9Be and 12C, both at-rest and in-flight. AMADEUS step 0 consisted in the analysis of the 2004-2005 KLOE data. A second step consisted in the implementation in the central region of the KLOE detector of a pure graphite target, providing a high statistic sample of K − 12 C nuclear captures at rest. For the future, new setups for various dedicated targets are under preparation.
Highlights
The AMADEUS experiment deals with the investigation of the low-energy kaon-nuclei hadronic interaction at the DAΦNE collider at LNF-INFN
Particular emphasis is put on the results of the analysis of the Σ0 p final state produced in absorption processes of K− on two or more nucleons, occurring in the entrance wall of the KLOE drift chamber (DC), and on the search for a signature of the ppK− → Σ0 p kaonic bound state
The particle identification is done using energy information coming from the Drift Chamber wires and, only for the protons, from the Calorimeter, while the momenta are reconstructed from the tracks collected in the DC; the final selection is performed via the two-dimensional plot of energy and momentum
Summary
Bound states, as ppK− or ppnK−, might occur The observation of such states and the measurement of their binding energies and widths would provide a measurement of the K-nucleon interaction in vacuum, as an important reference for the investigation of the in-medium properties of kaons. Absorption processes play an important role in the understanding of kaonic atoms, where a substantial multi-nucleon component is put forward by some theoretical models [14]. Measurements of these processes have been carried out and reported in [15, 16]. Particular emphasis is put on the results of the analysis of the Σ0 p final state produced in absorption processes of K− on two or more nucleons, occurring in the entrance wall of the KLOE drift chamber (DC), and on the search for a signature of the ppK− → Σ0 p kaonic bound state
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