Abstract
The DEAR experiment at LNF delivered the most precise data on kaonic hydrogen up to now and triggered new theoretical studies. DEAR and its follow‐up experiment SIDDHARTA are using precision X‐ray spectroscopy of kaonic hydrogen and kaonic deuterium atoms to measure the strong interaction induced shift and width of the ground state. From these observables the isospin‐dependent antikaon‐nucleon scattering lengths can be determined, thus contributing to the understanding of aspects of chiral symmetry breaking in the strangeness sector.
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