Bound kaon approach for the ppK − system in the Skyrme model

摘要

The lightest nuclear [`(K)]overline K bound state, ppK −, is investigated in the Skyrme model. We describe the ppK − as two-Skyrmion around which a kaon field fluctuates. The two-Skyrmion is projected onto the (pp) _S=0 state using the collective coordinate quantization method. We find that the energy of K − can be considerably small, and that ppK − is a molecular state. The binding energy of the ppK − and the mean pp distance are estimated to be B.E. = 104–126 MeV and Ö{ár_pp2ñ}sqrt{langle r_{pp}^{2}rangle} = 1.6–1.8 fm, respectively.