Super strong nuclear force caused by migrating K̄ mesons - Revival of the Heitler-London-Heisenberg scheme in kaonic nuclear clusters

We have studied the structure of K(−)pp comprehensively by solving this threebody system in a variational method, starting from the Ansatz that the Λ(1405) resonance (≡Λ(*)) is a K(−)p bound state. The structure of K(−)pp reveals a molecular feature, namely, the K(−) in Λ(*) as an “atomic center” plays a key role in producing strong covalent bonding with the other proton. We point out that strongly bound K̄ nuclear systems are formed by “super strong” nuclear force due to migrating real bosonic particles K̄ a la Heitler-London-Heisenberg, whereas the normal nuclear force is caused by mediating virtual mesons. We have shown that the elementary process, p + p → K(+) + Λ(*) + p, which occurs in a short impact parameter and with a large momentum transfer, leads to unusually large self-trapping of Λ(*) by the involved proton, since the Λ(*)-p system exists as a compact doorway state propagating to K(−)pp.