Searches for gluino-mediated production of third generation squarks with the ATLAS detector

Four searches for gluino-mediated production of third generation squarks in proton-proton collisions at $\sqrt{s} = 8 TeV$ with the ATLAS detector are presented. The searches use a data sample collected in 2012, corresponding to a total integrated luminosity of approximately $20 fb^{-1}$. No deviation from the Standard Model expectation is observed. Exclusion limits are set on simplified supersymmetry models motivated by naturalness arguments.