Understanding L(1405) nature in the low-energy kaon-nuclei interactions within the AMADEUS program

The AMADEUS collaboration has the goal to perform unprecedented measurements in the field of the low-energy charged kaons-nuclei interactions, by completing the existing KLOE detector with a dedicated setup in the inner region. As a preliminary step towards the realization, the AMADEUS team has analyzed the 2002-2005 KLOE data, studying the processes resulting from the negative kaons nuclear absorption in the entrance wall of the KLOE Drift Chamber (containing mostly carbon) and in the gas filling it, mostly helium. These analyses already produced unique results, especially in the Σπ and Λπ final states. In particular, it was proven that an in-flight component is present in the KLOE data, which allows the investigation of a larger invariant mass region with respect to the old bubble chamber experiments, leading to a deeper comprehension of the Λ(1405) nature. The proof of the presence of an in-flight componente in the 2002-2005 KLOE data is presented, together with a discussion of its implications in the determination of the Λ(1405) resonance shape.