Nuclear physics experiment observes a kaonic dibaryon structure in pion-deuteron collisions, suggesting the formation of deeply bound kaonic nuclear states.
We have observed a “|K⁻pp|”-like structure in the |d(π ⁺,K⁺)| reaction at 1.69 GeV|$/c$|. In this reaction, a |Λ (1405)| hyperon resonance is expected to be produced as a doorway to form |K⁻pp| through the |Λ p→ K⁻pp| process. However, most of the |Λ (1405)| produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum (|$>$|250 MeV|$/c$|) proton(s) at large emission angles (|39^∘ < θ lab. < 122^∘|) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV|/c²|, which corresponds 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.
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Ichikawa et al. (2015) studied this question.
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