Unveiling the strangeness secrets: low-energy kaon-nucleon/nuclei interactions studies at DAΦNE

The DAΦNE electron-positron collider at the Frascati National Laboratory of INFN (Italy) has made available a unique quality low-energy negatively charged kaons 'beam', which is used to unveil the secrets of the kaon-nucleon/nuclei interactions at low energies through the SIDDHARTA-2 and AMADEUS experiments. SIDDHARTA has already performed unprecedented precision measurements of kaonic atoms, and is being presently upgraded, as SIDDHARTA-2, to approach new frontiers. SIDDHARTA-2 will measure the kaonic deuterium transitions to the 1s level. The AMADEUS experiment will perform the first complete study of the low-energy kaon-nuclei interactions by using a series of cryogenic gaseous targets as d, ³He, ⁴He, and solid targets. Among the aims of AMADEUS are: the measurement of the Λ(1405) decaying to Σ π in all possible combinations and to give a definite answer to the debated question of the existence of the kaonic nuclei. If such states exist we will measure their properties (binding energies, width and decay channels)