Kaonic nuclear state search at J-PARC

At J-PARC, there are two experimental programs, E15 and E27, to search for the simplest kaonic bound nuclear state in K̄NN system. These two experiments were proposed based preceding experiments reporting candidates of such state, although the experimental results are not quite consistent to each other. These two experimental programs utilizing different reaction channels, ³He(K−, n) reaction by K⁻ momentum at 1 GeV/c for E15, and d(π⁺, K⁺) reaction by π⁺ momentum at 1.7 GeV/c for E27, to resolve this puzzling situation. In this paper, we overview these two experimental results as flat as possible.