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Very recently, we have performed a couple of experiments, {\it{KEKPS-E549/E570}}, for the detailed study of the strange tribaryon $S^0(3115)$obtained in {\it{KEK PS-E471}}. These experiments were performed to accumulatemuch higher statistics with improved experimental apparatusespecially for thebetter proton spectroscopy of the $^4$He({\it{stopped K}}$^-$, {\it{N}})reaction. In contrast to the previous proton spectrum, no narrow ($\sim$ 20MeV) peak structure was found either in the inclusive $^4$He({\it{stoppedK}}$^-$, {\it{p}}) or in the semi-inclusive $^4$He({\it{stopped K}}$^-$,{\it{p}}$X^\pm$) reaction channel, which is equivalent to the previous $E471$event trigger condition. Detailed analysis of the present data and simulationshows that the peak, corresponding to $S^0(3115)$, has been an experimentalartifact. Present analysis does not exclude the possible existence of a muchwider structure. To be sensitive to such structure and for better understandingof the non-mesonic $K^-$ absorption reaction channel, detailed analysis of thedata is in progress.

Search for a kaonic nuclear state via $^4$He$(K^-, N)$