Abstract

The interaction of antikaons (K−) with nucleons and nuclei in the low-energy regime represents a very active research field in hadron physics. A unique and rather direct experimental access to the antikaon-nucleon scattering lengths is provided by precision X-ray spectroscopy of transitions in low-lying states in the lightest kaonic atoms (i.e. kaonic hydrogen and deuterium). In the SIDDHARTA experiment at the electron-positron collider DAFNE of LNFINFN we measured the most precise values of the strong interaction observables in conic hydrogen. The strong interaction on the 1s ground state of the electromagnetically bound K-p atom causes an energy shift and broadening of the 1s state. SIDDHARTA will extend the spectroscopy to kaonic deuterium to get access to the antikaon-neutron interaction and thus the isospin dependent scattering lengths. At J-PARC a kaon beam is used in a complementary experiment with a different setup for spectroscopy of kaonic deuterium atoms. The talk will give an overview of the of the upcoming experiments SIDDHARTA and the complementary experiment at J-PARC.Furthermore, the implications of the experiments for the theory of low-energy strong interaction with strangeness will be discussed.

Highlights

  • In the low-energy domain the interaction of antikaons (K−) with nucleons and nuclei numerous studies in experiment and theory were performed

  • The interaction of K− (K) with nucleons in the two isospin states can be precisely determined by X-ray spectroscopy of the simplest kaonic atoms, i.e. kaonic hydrogen and kaonic deuterium

  • The lightest kaonic atom is the K−p atom in which the principal interaction is the electromagnetic interaction accompanied by the strong interaction of the kaon with the proton which is measurable by X-ray spectroscopy of the radiative transitions from the p states (2p, 3p, ... for n=2,3,....) to the 1s ground state (K transitions)

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Summary

Introduction

In the low-energy domain the interaction of antikaons (K−) with nucleons and nuclei numerous studies in experiment and theory were performed (for reviews see [1]). The interaction of K− (K) with nucleons in the two isospin states can be precisely determined by X-ray spectroscopy of the simplest kaonic atoms, i.e. kaonic hydrogen and kaonic deuterium. In these exotic atoms the strong interaction leads to an energy shift 1s from the calculated electromagnetic value (i.e. without strong interaction) and a broadened width Γ1s of the 1s ground state. The lightest kaonic atom is the K−p atom in which the principal interaction is the electromagnetic interaction accompanied by the strong interaction of the kaon with the proton which is measurable by X-ray spectroscopy of the radiative transitions from the p states These successful experiments will be complemented by a first measurement of the even more challenging study of the X-ray spectrum of kaonic deuterium

Kaonic hydrogen
Kaonic deuterium with SIDDHARTA2
Kaonic deuterium at J-PARC
Findings
Summary
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