The kaonic atoms research program at DAΦNE: From SIDDHARTA to SIDDHARTA-2

Research output: Contribution to journalArticle


The interaction of antikaons with nucleons and nuclei in the low-energy regime represents an active research field in hadron physics with still many important open questions. The investigation of light kaonic atoms, in which one electron is replaced by a negatively charged kaon, is a unique tool to provide precise information on this interaction; the energy shift and the broadening of the low-lying states of such atoms, induced by the kaon-nucleus hadronic interaction, can be determined with high precision from the atomic X-ray spectroscopy, and this experimental method provides unique information to understand the low energy kaon-nucleus interaction at the production threshold. The lightest atomic systems, like the kaonic hydrogen and the kaonic deuterium deliver, in a model-independent way, the isospin-dependent kaon-nucleon scattering lengths. The most precise kaonic hydrogen measurement to-date, together with an exploratory measurement of kaonic deuterium, were carried out in 2009 by the SIDDHARTA collaboration at the DAΦNE electron-positron collider of LNF-INFN, combining the excellent quality kaon beam delivered by the collider with new experimental techniques, as fast and very precise X-ray detectors, like the Silicon Drift Detectors. The SIDDHARTA results triggered new theoretical work, which achieved major progress in the understanding of the low-energy strong interaction with strangeness reflected by the antikaon-nucleon scattering lengths calculated with the antikaon-proton amplitudes constrained by the SIDDHARTA data. The most important open question is the experimental determination of the hadronic energy shift and width of kaonic deuterium; presently, a major upgrade of the setup, SIDDHARTA-2, is being realized to reach this goal. In this paper, the results obtained in 2009 and the proposed SIDDHARTA-2 upgrades are presented.


  • A. Scordo
  • A. Amirkhani
  • M. Bazzi
  • G. Bellotti
  • C. Berucci
  • D. Bosnar
  • A. M. Bragadireanu
  • M. Cargnelli
  • C. Curceanu
  • A. Dawood Butt
  • R. Del Grande
  • L. Fabbietti
  • C. Fiorini
  • F. Ghio
  • C. Guaraldo
  • R. S. Hayano
  • M. Iliescu
  • M. Iwasaki
  • P. Levi Sandri
  • J. Marton
  • And 14 others
  • M. Miliucci
  • P. Moskal
  • D. Pietreanu
  • K. Piscicchia
  • H. Shi
  • M. Silarski
  • D. Sirghi
  • F. Sirghi
  • M. Skurzok
  • A. Spallone
  • H. Tatsuno
  • O. Vazquez Doce
  • E. Widmann
  • J. Zmeskal
External organisations
  • Polytechnic University of Milan
  • Stefan Meyer Institute for Subatomic Physics (SMI)
  • University of Zagreb
  • “Horia Hulubei” National Institute of Physics and Nuclear Engineering
  • Technical University of Munich
  • University of Tokyo
  • Enrico Fermi Historical Museum of Physics and Study and Research Centre
  • Jagellonian University
  • Frascati National Laboratory of INFN
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number01004
JournalEPJ Web of Conferences
Publication statusPublished - 2018 Jun 25
Publication categoryResearch
Event2017 International Conference on Exotic Atoms and Related Topics, EXA 2017 - Vienna, Austria
Duration: 2017 Sep 112017 Sep 15