K̄NN quasibound state and the K̄N interaction: Coupled-channels Faddeev calculations of the K̄NN-πΣN system

Coupled-channels three-body calculations of an I=1/2,Jπ=0- K̄NN quasibound state in the K̄NN-πΣN system were performed and the dependence of the resulting three-body energy on the two-body K̄N-πΣ interaction was investigated. Earlier results of binding energy BK-pp~50-70 MeV and width ΓK-pp~100 MeV are confirmed [N. V. Shevchenko, Phys. Rev. Lett. 98, 082301 (2007)]. It is shown that a suitably constructed energy-independent complex K̄N potential gives a considerably shallower and narrower three-body quasibound state than the full coupled-channels calculation. Comparison with other calculations is made.