Abstract
The understanding of the low-energy strong interaction involving strangeness is a challenging topic due to resonances and predicted kaonic nuclear bound states. The K- nucleon interaction is strongly attractive at low energies verified in kaonic hydrogen studied in the SIDDHARTA experiment at the DA[Formula: see text]NE electron-positron collider of LNF-INFN (Frascati/Italy). Hyperon resonances like the elusive [Formula: see text] in the s-wave impose questions about its nature. According to theoretical studies it can be described as a dynamically generated resonance with two poles or a quasi-bound [Formula: see text]N state, which could lead to kaonic nuclear bound states (e.g. K-pp). An insight in many open facets of the antikaon interactions can be provided by the AMADEUS experiment at DA[Formula: see text]NE based on the analysis of the data collected in 2004/2005 by the KLOE collaboration, and of the dedicated data set collected in 2012 by AMADEUS in collaboration with KLOE. As a first step data from antikaon-induced reactions in the drift chamber of KLOE were analyzed and yielded new results on antikaon absorption on nuclei. Recent results of the experimental studies and an outlook to the future possibilities within AMADEUS are presented.
Highlights
The experimental investigation of negative kaon induced reactions in nuclear matter is a crucial test for the low energy strangeness QCD
A spectroscopic study of the kinematic region ranging between the at-rest energy threshold, and the K N threshold, opened by the low momentum in-flight capture process, is presently ongoing in order to clarify the nature of the high mass Λ(1405) pole
In this work the low energy negatively charged kaons absorption processes on light nuclear targets is investigated with the aim to extract the resonant and non-resonant hyperon-pion production amplitudes
Summary
In this sector chiral perturbation theory can not be applied due to the existence of the Λ(1405) just few Mev below the K N threshold, which renders this a difficult multi-channel nonperturbative problem. The Λ(1405) is a JP = 1/2− isospin I = 0 strangeness -1 state, which decays into (Σπ)[0] through the strong interaction, whose existence was predicted by Dalitz and Tuan in 1959;1 despite the first experimental evidence This is an Open Access article published by World Scientific Publishing Company. A review of the theoretical and experimental investigation can be found in.[3] The bubble chamber search lead to different positions of the resonance (see for example4–6) for different charged combinations of the Σ and the π This can be understood as a consequence of the isospin interference term. For the dibaryonic kaonic bound state ppK− theoretical predictions deliver a wide range of binding energies and widths,[19] while the experimental results are contradictory.[20,21,22,23,24,25,26,27,28,29] The extraction of ppK− signal in K− absorption experiments is strongly affected by the yield and the shape of the competing K− multi-nucleon absorption processes as clearly evidenced in,[30] where the yield of the K− double-nucleon absorption, when the produced Σ0p pairs are free from final state interactions,[31] was measured for the first time
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