Kaonic atoms measurements at the DAΦNE collider: the SIDDHARTA-2 experiment

C Curceanu ,Pietro King,Francesco Sgaramella,Szymon Niedźwiecki,Marco Carminati,P Levi Sandri ,A Scordo ,O Vázquez Doce ,A Spallone ,F Napolitano ,R Del Grande ,F Sirghi ,M Miliucci ,P Moskal ,M Silarski ,M Iliescu ,M Skurzok ,M Tüchler ,K Piscicchia ,C Fiorini ,D Bosnar ,D Sirghi ,L De Paolis ,J Márton ,M Bazzi ,C Guaraldo ,A Clozza ,H Shi ,M Bragadireanu ,M Cargnelli ,G Deda ,M Iwasaki ,J Zmeskal

doi:10.1051/epjconf/202225807006

Abstract

The X-ray spectroscopy measurements of light kaonic atoms’ deexcitation towards the fundamental level provide unique information on the low-energy Quantum ChromoDynamics (QCD) in the strangeness sector, being a direct probe of the kaon/nucleon interaction at threshold, unobtainable through the scattering experiments. In this framework, the SIDDHARTA-2 collaboration is going to perform the first kaonic deuterium 2p → 1s transition measurement at the DAΦNE collider of Istituto Nazionale di Fisica Nucleare – Laboratori Nazionali di Frascati. Combining this measurement with the kaonic hydrogen one performed by SIDDHARTA in 2009 it will be possible to obtain, in a model-independent way, the isospin-dependent antikaon-nucleon scattering lengths. The paper introduces the SIDDHARTA-2 setup, an upgraded version with respect to the one used for the kaonic hydrogen measurement, dedicated to the ambitious kaonic deuterium measurement, together with the preliminary results obtained during the kaonic helium run, preparatory for the SIDDHARTA-2 data taking campaign.

Highlights

Kaonic atoms are systems in which a negatively charged kaon (K-) is bound to the nucleus by electromagnetic interaction
The X-ray spectroscopy measurements of the strong interaction induced shift and width for the 1s level of light kaonic atoms, in particular for hydrogen and deuterium, is a key tool to experimentally probe the low-energy KN interaction at vanishing energies, providing information on the relationship between spontaneous and explicit chiral symmetry breaking in low-energy Quantum ChromoDynamics (QCD)
The setup is presently installed at the DAΦNE collider of Istituto Nazionale di Fisica Nucleare – Laboratori Nazionali di Frascati (INFN-LNF), ready to measure the kaonic deuterium 1s level shift (✏) and width (Γ), important for a deeper understanding of the non-perturbative QCD in the strangeness sector, with implications from particle and nuclear physics to astrophysics [4]-[7]

Summary

Light kaonic atoms X-ray spectroscopy

Kaonic atoms are systems in which a negatively charged kaon (K-) is bound to the nucleus by electromagnetic interaction. Kaonic atoms X-ray spectroscopy is a perfect tool to directly investigate the strong interaction in the low-energy limit, the so-called non-perturbative regime, without the need of extrapolation to zero energy as for the scattering experiments. In this context, the X-ray spectroscopy measurements of the strong interaction induced shift and width for the 1s level of light kaonic atoms, in particular for hydrogen and deuterium, is a key tool to experimentally probe the low-energy KN interaction at vanishing energies, providing information on the relationship between spontaneous and explicit chiral symmetry breaking in low-energy Quantum ChromoDynamics (QCD). The setup is presently installed at the DAΦNE collider of Istituto Nazionale di Fisica Nucleare – Laboratori Nazionali di Frascati (INFN-LNF), ready to measure the kaonic deuterium 1s level shift (✏) and width (Γ), important for a deeper understanding of the non-perturbative QCD in the strangeness sector, with implications from particle and nuclear physics to astrophysics [4]-[7]

The SIDDHARTA-2 experiment at the DAΦNE collider

Findings

Conclusion