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The AMADEUS collaboration has the goal to perform unprecedented measurementsin the field of the low-energy charged kaons-nuclei interactions, byimplementing the existing KLOE detector with a dedicated setup in the innerregion. As a preliminary step towards the realization, the AMADEUS team hasanalyzed the existent 2002-2005 KLOE data, studying the processes resultingfrom the negative kaons nuclear absorption in the entrance wall of the KLOEDrift Chamber (containing mostly carbon) and in the gas filling it, mostlyhelium. Processes containing Lambda-p and Lambda-d in the final state werelooked for, together with the search for the Lambda(1405) going in both theneutral and the charged Sigma-pi channels. These analyses produced uniqueresults, proving the possibility to obtain, for the first time, invariant massspectra of the Lambda(1405) for all the possible decay channels. This waspossible thanks to the unique features of the KLOE detector, including theexcellent photon detection of its calorimeter. In addition to these results,other interesting effects like the Sigma->Lambda internal conversion could beinvestigated. Preliminary results on the Sigma+pi- decay channel and on theSigma->Lambda internal conversion will be presented.

Study of $\Sigma^+\pi^-$ Invariant Mass spectrum with the KLOE detector; preliminary results and possible hints for $\Sigma^+n$ internal conversion