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We have observed a "$K^-pp$"-like structure in the $d(\pi^+,K^+)$ reaction at1.69 GeV/$c$. In this reaction $\Lambda(1405)$ hyperon resonance is expected tobe produced as a doorway to form the $K^-pp$ through the $\Lambda^*p\rightarrowK^-pp$ process. However, most of the produced $\Lambda(1405)$'s would escapefrom deuteron without secondary reactions. Therefore, coincidence ofhigh-momentum ($>$ 250~MeV/$c$) proton(s) in large emission angles($39^\circ<\theta_{lab.}<122^\circ$) was requested to enhance thesignal-to-background ratio. A broad enhancement in the proton coincidencespectra are observed around the missing-mass of 2.27 GeV/$c^2$, whichcorresponds to the $K^-pp$ binding energy of 95 $^{+18}_{-17}$ (stat.)$^{+30}_{-21}$ (syst.) MeV and the width of 162 $^{+87}_{-45}$ (stat.)$^{+66}_{-78}$ (syst.) MeV.

Observation of the "$K^-pp$"-like structure in the $d(\pi^+, K^+)$ reaction at 1.69 GeV/$c$