Comparison of NˉN\bar{\hbox{N}}\hbox{N} optical models

We compare the strong part of the $\bar{\hbox{N}}\hbox{N}$ interaction obtained by the Nijmegen partial wave analysis and the results of some of the most popular $\bar{\hbox{N}}\hbox{N}$ optical potentials in configuration space. We have found severe discrepancies in most of the partial waves, especially above $p_{Lab}$=400 MeV/c where the partial wave analysis displays a resonant-like structure in the $^{31}$S$_0$ and $^{33}$P$_0$ waves. Some theoretical difficulties to interpret this behaviour in terms of dynamical resonances are pointed pout and an alternative explanation is suggested. A much better stability is observed in the low energy parameters, apart from some discrepancies due to the presence of near-threshold quasi-bound states in particular waves. Large deviations have also been found between the corresponding potentials, at short and medium-range ($r\gtrsim 1$ fm) distances

Trapping of Σ

The nuclear capture of K− studied by FINUDA discovered a puzzling low momentum component in the spectrum of final Σ+ hyperon. This component is interpreted here as the effect of Gamov state formed by the hyperon. Such state is quasi-localized in space with a radius in between the hyper-nuclear and the hyper-atomic radius. Experimental and theoretical consequences of this discovery are studied

Comparison of NˉN\bar{\hbox{N}}\hbox{N} optical models

International audienceWe compare the strong part of the $\bar{\hbox{N}}\hbox{N}$ interaction obtained by the Nijmegen partial wave analysis and the results of some of the most popular $\bar{\hbox{N}}\hbox{N}$ optical potentials in configuration space. We have found severe discrepancies in most of the partial waves, especially above $p_{Lab}$=400 MeV/c where the partial wave analysis displays a resonant-like structure in the $^{31}$S$_0$ and $^{33}$P$_0$ waves. Some theoretical difficulties to interpret this behaviour in terms of dynamical resonances are pointed pout and an alternative explanation is suggested. A much better stability is observed in the low energy parameters, apart from some discrepancies due to the presence of near-threshold quasi-bound states in particular waves. Large deviations have also been found between the corresponding potentials, at short and medium-range ($r\gtrsim 1$ fm) distances

Search for Deeply Bound Kaonic Nuclear States with AMADEUS

We briefly report on the search for Deeply Bound Kaonic Nuclear States with AMADEUS in the Σ0p channel following K− absorption on 12C and outline future perspectives for this work

Investigation of the low-energy K - Hadronic interactions with light nuclei by AMADEUS

The aim of the AMADEUS collaboration is to provide new experimental constraints to the antikaon-nucleon ( ¯KN) strong interaction in the regime of non-perturbative QCD, investigating the low-energy K− hadronic interactions with light nuclei like H, 4He, 9Be and 12C. The unique low-momentum kaon beam produced at the DAΦNE collider is ideal to study K− nuclear captures, both at-rest and in-flight. The large acceptance KLOE detector used as an active target allows to achieve excellent position and momentum resolutions. In this work a brief description of recent AMADEUS results is presented