Further Evidence for an unstable H-Dibaryon?

We present preliminary results for the mass of the 6q flavor-singlet state ($J^P=0^{+}$, $S=-2$) called H-dibaryon, calculated in quenched QCD on ${16}^3$x30 and ${24}^3$x30 lattices with improved gauge and fermion actions (Symanzik improvement, Clover action). For both lattice sizes we applied the fuzzing technique to enhance the overlap with the ground state. We observe a H-mass above the $\mathrm{\Lambda }\mathrm{\Lambda }$ threshold for strong decay. The difference in mass, $m_H-2m_{\mathrm{\Lambda }}$, increases with increasing lattice size.