Faddeev-Yakubovsky search for Lambda-Lambda hydrogen-4
  Evidence for particle stability of Lambda-Lambda hydrogen-4 (4LLH) has been suggested by the BNL-AGS E906 experiment. We report on Faddeev-Yakubovsky calculations for the four-body Lambda-Lambda-p-n system using Lambda-N interactions which reproduce the observed binding energy of Lambda hydrogen-3 (3LH) within a Faddeev calculation for the Lambda-p-n subsystem. No 4LLH bound state is found over a wide range of Lambda-Lambda interaction strengths, although the Faddeev equations for a three-body Lambda-Lambda-d model of 4LLH admit a 1+ bound state for as weak a Lambda-Lambda interaction strength as required to reproduce the binding energy of Lambda-Lambda Helium-6 (6LLHe). 
I.N. Filikhin (St. Petersburg State U), A. Gal (Hebrew U Jerusalem)