Abstract
The DEAR (DAΦNE Exotic Atom Research) experiment and the successor SIDDHARTA (Silicon Drift Detectors for Hadronic Atom Research by Timing Application) are using precision X‐ray spectroscopy of kaonic hydrogen atoms to determine the strong interaction induced shift and width of the ground state. From the kaonic hydrogen and kaonic deuterium shifts and widths the isospin‐dependent antikaon‐nucleon scattering lengths can be determined, thus contributing to the understanding of chiral symmetry breaking in the strangeness sector.The experimental method of the DEAR experiment and the final results of the kaonic atom studies are presented, i.e. the first measurement of three X‐ray transitions of kaonic nitrogen and the most precise measurement of the strong interaction caused shift and width in kaonic hydrogen obtained up to now.An outlook to the next steps of the experimental program will be given.
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