New way to produce dense double-antikaonic dibaryon system, 𝐾̄𝐾̄NN, through Λ(1405)-doorway sticking in p + p collisions

A recent successful observation of a dense and deeply bound 𝐾̄ nuclear system, K(−)pp, in the p + p → K(+) + K(−)pp reaction in a DISTO experiment indicates that the double-𝐾̄ dibaryon, K(−)K(−)pp, which was predicted to be a dense nuclear system, can also be formed in p + p collisions. We find theoretically that the K(−)-K(−) repulsion plays no significant role in reducing the density and binding energy of K(−)K(−)pp and that, when two Λ(1405) resonances are produced simultaneously in a short-range p + p collision, they act as doorways to copious formation of K(−)K(−)pp, if and only if K(−)K(−)pp is a dense object, as predicted.