Our answer to the question posed in the title is: probably no. In this work we show that it is rather unlikely that the structure X(2265) reported by the DISTO collaboration corresponds to a kaonic nuclear bound state. The main argumentation is based on the repetition of the DISTO analysis on the HADES data sample, containing p+p reactions at 3.5 GeV. We further discuss many aspects in connection with the pK+Λ final state and the Λ(1405)-resonance. The results evidence possible problematics in the interpretation of the DISTO data.
@article{arxiv.1504.02060,
title = {Has a "$ppK^{-}$" Signal in p+p Reactions been Observed Yet?},
author = {Eliane Epple and Laura Fabbietti},
journal= {arXiv preprint arXiv:1504.02060},
year = {2015}
}