In the framework of the Faddeev equations in configuration space we
perform an analysis of quasi-bound state of the
NN{\bar K}NNK‾
system within a particle model. In our approach, the system
NN{\bar K}(s_{NN}=0)NNK‾(sNN=0)
(NN{\bar K}(s_{NN}=1))NNK‾(sNN=1))
is described as a superposition of ppK^{-}ppK−
and pn{\bar K}^0pnK‾0
(nn{\bar K}^{0}nnK‾0
and pn{ K}^-pnK−)
states, which is possible due to a particle transition. The relation of
the particle model to the theory of a two-state quantum system is
addressed and discussed taking into account the possibilities of deep
and shallow NN{\bar K}(s_{NN}=0)NNK‾(sNN=0)
quasi-bound states.
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