The measurement of the top-quark Yukawa coupling is possible using the Higgs production in association with a pair of top quarks (ttH). The bb final state features the largest branching ratio among the various ttH decay modes, however its understanding is very challenging in light of the overwhelming non-resonant ttbb background. ATLAS results in the H->bb final state (https://arxiv.org/abs/1712.08895) will be presented in this seminar with a particular focus on the flavour-tagging algorithm developments and optimisations as well as the typical b-jet reconstruction and identification performance achieved.
