Kaonic atom spectroscopy provides key observables for investigating low-energy strong interactions in strange systems. In this paper, we present an overview of the SIDDHARTA-2 collaboration’s activities in the field of kaonic atoms, with a particular focus on the development of a new Cadmium-Zinc-Telluride (CZT) detector system for the study of intermediate-mass kaonic atoms.

This novel detection system, applied for the first time in fundamental physics research at a collider, is designed to extend the energy range accessible in kaonic atom spectroscopy. We report on the characteristics of the detector and the results of test measurements conducted at the DA$\Phi$NE collider between 2022 and 2024.The tests demonstrated that the detector’s energy resolution, efficient background rejection, and good timing performance make it ideal for performing kaonic atom measurements.

The ultimate goal of these developments is to refine our understanding of kaon-multinucleon low-energy strong interactions by providing high-precision measurements of intermediate-mass kaonic atoms.