Critical review ofK−ppnbound states

Abstract

We make a thorough study of the process of three-body kaon absorption in nuclei, in connection with a recent FINUDA experiment which claims the existence of a deeply bound kaonic state from the observation of a peak in the d invariant mass distribution following K − absorption on 6 Li. We show that the peak is naturally explained in terms of K − absorption from three nucleons leaving the rest as spectators. We can also reproduce all the other observables measured in the same experiment and used to support the hypothesis of the deeply bound kaon state. Our study also reveals interesting aspects of kaon absorption in nuclei, a process that must be understood in order to make progress in the search for K − deeply bound states in nuclei.

Strange mesons in nuclear matter at finite temperature

“…The experimental observations could be explained simply either by the two-body absorption mechanism raised in Ref. [17], without [18][19][20][21] or with [22,23] final-state interactions, or coming from a three-body absorption process [24][25][26]. Actually, recent improved few-body calculations using realisticKN interactions and short-range correlations [27][28][29][30] predict few-nucleon kaonic states bound only by MeV and having large widths of the order on 100 MeV, thereby disclaiming the findings of Refs.…”

A method to measure the Kbar-N scattering length in lattice QCD

“…Refs. [1,2,3,4]. In particular, theKN system at threshold provides an interesting testing ground of the chiral dynamics of QCD with strange quarks due to the Λ(1405) resonance just below the scattering threshold.…”

Kaonic systems

“…This looks then as a lost case for experimental observation, although claims were done about its observation. We refrain from quoting these works here and lead to reader to papers where these issues are discussed in detail showing that the peaks observed experimentally come from conventional, unavoidable mechanisms, related to the absorption of the kaon by a pair of nucleons [24][25][26][27].…”