Faddeev Treatment of the Quasi-Bound and Scattering States in the K¯NN−πΣN System: New Results

A chiral-motivated K¯N−πΣ−πΛ potential was constructed and used in Faddeev calculations of different characteristics of K¯NN−πΣN system. First of all, binding energy and width of the K− pp quasi-bound state were newly obtained. The low-energy K− d scattering amplitudes, including scattering length, together with the 1s level shift and width of kaonic deuterium were calculated. Comparison with the results obtained with the phenomenological K¯N−πΣ potential demonstrates that the chiral-motivated potential gives more shallow K− pp state, while the characteristics of K− d system are less sensitive to the form of K¯N interaction. (author)