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

Abstract

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.

References in corpus (13)

• A New Measurement of Kaonic Hydrogen X rays
• The nature of the Lambda(1405) resonance in chiral dynamics
• In-medium nuclear interactions of low-energy hadrons
• Improved constraints on chiral SU(3) dynamics from kaonic hydrogen
• Kaonic hydrogen X-ray measurement in SIDDHARTA
• Precision measurement of the $3d\to 2p$ x-ray energy in kaonic ${}^4$He
• First measurement of kaonic helium-3 X-rays
• S-Wave Scattering of Fermion Revisited
• K${}^{-}$ absorption on two nucleons and ppK${}^{-}$ bound state search in the ${\Sigma }^0$p final state
• Chiral SU(3) Dynamics with Coupled Channels: Inclusion of P-Wave Multipoles
• Preliminary study of kaonic deuterium X-rays by the SIDDHARTA experiment at DAFNE
• Measurements of the strong-interaction widths of the kaonic 3He and 4He 2p levels
• The Uehling correction to the energy levels in a pionic atom

Cited by in corpus (1)

• QCD and the Strange Baryon Spectrum