The search for the Standard Model Higgs boson produced in association with a vector boson and decaying to bottom quarks with the ATLAS detector

These proceedings present an updated search for the Standard Model Higgs boson produced in association with a $W$ or $Z$ boson and decaying to $\bar{b}$. The analysis uses $4.7~\mathrm{fb}^{-1}$ of LHC proton-proton collision data at 7 TeV and $13.0~\mathrm{fb}^{-1}$ at 8 TeV recorded by the ATLAS experiment. The search is performed using events containing zero, one or two electrons or muons targeting the decay modes $ZH\to\nu\bar{\nu}b\bar{b}$, $WH\to\ell\nu b\bar{b}$ and $ZH\to\ell^+\ell^- b\bar{b}$. No significant excess is observed. For $m_H = 125$~GeV, the observed (expected) upper 95% confidence level limit on the cross section times the branching ratio is 1.8 (1.9) times the Standard Model prediction. A Standard Model Higgs boson with $m_H = 110$~GeV is excluded. As a validation of the analysis method, the production of diboson pairs, $WZ$ and $ZZ$, with a $Z$ boson decaying to $\bar{b}$, has been observed with a significance of 4.0 standard deviations and a rate compatible with the Standard Model expectation. A search was also made in the $t \bar{t}H$ channel using 4.7~mathrm{fb}^{-1} of LHC data at 7 TeV, focusing on the semileptonic decay mode of the $tar{t}$ system. For a Higgs boson with $m_H = 125~GeV$, the observed (expected) 95% confidence-level upper limits are 13.1 (10.5) times the Standard Model using $t \bar{t}H$.