Kaonic Atoms at the DA$\Phi$NE Collider with the SIDDHARTA-2 Experiment

TL;DR

The SIDDHARTA-2 experiment aims to measure kaonic deuterium X-ray transitions to precisely determine antikaon-nucleon scattering lengths, advancing understanding of quantum chromodynamics in the strangeness sector.

Contribution

This paper reports the initial experimental results from the preparatory run of the SIDDHARTA-2 experiment, which seeks to measure kaonic deuterium for the first time.

Findings

Preliminary data collected during the preparatory run.

Progress towards disentangling isoscalar and isovector scattering lengths.

Enhanced understanding of low-energy QCD in the strangeness sector.

Abstract

Kaonic atoms are a unique tool to explore quantum chromodynamics in the strangeness sector at low energy, with implications reaching neutron stars and dark matter. Precision X-ray spectroscopy can fully unlock the at-threshold isospin dependent antikaon-nucleon scattering lengths, via the atomic transitions to the fundamental level. While the SIDDHARTA experiment at the INFN-LNF DA$\Phi$NE collider successfully measured kaonic hydrogen, its successor SIDDHARTA-2 is starting now its data taking campaign aiming to finally fully disentangle the isoscalar and isovector scattering lengths via the measurement of kaonic deuterium. An overview of the first experimental results from a preparatory run for the SIDDAHARTA-2 experiment is presented.