Abstract
The interaction of antikaons with nucleons and nuclei in the lowenergy regime is a very active research field in hadron physics. Specially, the antikaon-nucleon interaction close to threshold provides crucial information on the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD and touching one of the fundamental problems in hadron physic today - the still unsolved question of how hadron masses are generated. To study this problem, we have developed a new X–ray detector system and constructed an experimental apparatus to measure the kaonic deuterium 1s ground state shift and width with an accuracy of 60 eV and 140 eV, respectively.
Highlights
For kaonic hydrogen atoms a detectable energy shift of the 1s ground state has been found induced due to the strong interaction, as well as an observable energy broadened ground state level, caused by nuclear absorption
A determination of the isospin dependent (I=0 and I=1) antikaon−nucleon scattering lengths will be only possible by combining the result of the kaonic hydrogen and deuterium measurements
The K−p interaction is well understood from the recent results of kaonic hydrogen obtained from KpX [1] at KEK, DEAR [2] and from SIDDHARTA [3] at DAΦNE and the theoretical calculations based on these results [4], [5]
Summary
For kaonic hydrogen atoms a detectable energy shift of the 1s ground state has been found induced due to the strong interaction, as well as an observable energy broadened ground state level, caused by nuclear absorption. Measuring these observables kaonic hydrogen atoms offer the unique possibility to determine s−wave antikaon−nucleon scattering lengths at almost zero energy. A determination of the isospin dependent (I=0 and I=1) antikaon−nucleon scattering lengths will be only possible by combining the result of the kaonic hydrogen and deuterium measurements. This combined result will provide the most stringent constraints on the antikaon−nucleon interaction at low energy, promising a breakthrough for this field
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