Evidence for a Bound H-dibaryon from Lattice QCD

The NPLQCD lattice collaboration finds evidence for the existence of a bound H-dibaryon at a pion mass of $m_\pi\sim 389~{\rm MeV}$. Using the results of Lattice QCD calculations performed on four ensembles of anisotropic clover gauge-field configurations, with spatial extents of $L\sim 2.0$, $2.5$, $3.0$ and $3.9~{\rm fm}$ at a spatial lattice spacing of $b_s\sim 0.123~{\rm fm}$, an H-dibaryon bound by $B = 16.6 \pm 2.1 \pm 4.6~{\rm MeV}$ at a pion mass of $m_\pi\sim 389$ MeV is found. I will discuss this calculation and its results.