Three-body structure of the $nn\Lambda$ system with $\Lambda N-\Sigma N$   coupling
  The structure of the three-body $nn\Lambda$ system, which has been observed recently by the HypHI collaboration, is investigated taking $\Lambda N-\Sigma N$ coupling explicitly into account. The $YN$ and $NN$ interactions employed in this work reproduce the binding energies of $^3_{\Lambda}$H, $^4_{\Lambda}$H and $^4_{\Lambda}$He. We do not find any $^3_{\Lambda}n$ bound state, which contradicts the interpretation of the data reported by the HypHI collaboration. 
E. Hiyama, S. Ohnishi, B. F. Gibson, and Th. A. Rijken
nucl-th