Abstract
The AMADEUS experiment aims to provide unique quality data of K− hadronic interactions with light nuclear targets, in order to solve fundamental open questions in the non-perturbative strangeness QCD sector, like the controversial nature of the Λ(1405) state, the yield of hyperon formation below threshold, the yield and shape of multi-nucleon K− absorption, processes which are intimately connected to the possible existence of exotic antikaon multi-nucleon clusters. AMADEUS takes advantage of the DAΦNE collider, which provides a unique source of monochromatic low-momentum kaons and exploits the KLOE detector as an active target, in order to obtain excellent acceptance and resolution data for K− nuclear capture on H, 4 He, 9 Be and 12 C, both at-rest and in-flight.
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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