The Gell-Mann -- Okubo mass relation among baryons from fully-dynamical   mixed-action lattice QCD
  We explore the Gell-Mann--Okubo mass relation among the octet baryons using fully-dynamical, mixed-action (domain-wall on rooted-staggered) lattice QCD calculations at a lattice spacing of b ~ 0.125 fm and pion masses of m_pi ~ 290 MeV, 350 MeV, 490 MeV and 590 MeV. Deviations from the Gell-Mann--Okubo mass relation are found to be small at each quark mass. 
Silas R. Beane, Kostas Orginos and Martin J. Savage