Searches for the Higgs boson into fermions at ATLAS

The discovery of a Higgs-like boson by the ATLAS collaboration at the LHC relies on evidence from di-boson decays: $gammagamma$, $ZZ^*$ and $WW^*$. The Standard Model predicts that the Higgs boson with $m_Hsim125;mathrm{GeV}$ should also have significant branching ratios to pairs of bottom and charm quarks, tau-leptons and muons. Decays to these final states are significantly more challenging to detect due to large backgrounds and the requirement to search for associated production of the Higgs boson. These proceedings review searches from ATLAS for the Standard Model Higgs boson ($H$) into fermions: $H ightarrow au^+ au^-$, $H ightarrowmu^+mu^-$, $H ightarrow bar b$, in association with top-quark pairs and vector bosons and into invisible final states, $H ightarrow$ invisible, using up to $4.7 ;mathrm{fb}^{-1}$ of $sqrt{s} = 7;mathrm{TeV}$ and up to $21;mathrm{fb}^{-1}$ of $sqrt{s} = 8;mathrm{TeV}$ proton-proton collision data from the LHC. No observation of events above backgrounds expectations is observed in any of the searches. Limits are set on the Higgs boson production in the mass range $100;mathrm{GeV} < m_H < 150;mathrm{GeV}$.