Has a "$pp{K}^{-}$" Signal in p+p Reactions been Observed Yet?

Abstract

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 $p{K}^{+}\Lambda$ final state and the $\Lambda (1405)$-resonance. The results evidence possible problematics in the interpretation of the DISTO data.

9 pages, 11 figures

References in corpus (7)

• Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV
• The basic K nuclear cluster K- pp and its enhanced formation in the p + p -> K+ + X reaction
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