Search for the Higgs boson in the VH(bb) channel using the ATLAS detector

A search for the $b\bar{b}$ decay of the Standard Model Higgs boson is performed with the ATLAS experiment using the full dataset recorded at the LHC in Run 1. The integrated luminosities used from $pp$ collisions at $\sqrt{s}$ = 7 and 8 TeV are 4.7 and 20.3 fb$^{-1}$, respectively. The processes considered are associated $(W/Z)H$ production, with $W\rightarrow \ell\nu$, $Z\rightarrow\ell\ell$ ($\ell= e,\mu$), and $Z\rightarrow\nu\nu$. No significant excess is observed above the StandardModel (SM) backgrounds. For $m_H$ = 125 GeV, a 95% CL upper limit of 1.4 times the SM expectation is set on the cross section times branching ratio for $pp\rightarrow(W/Z)(H\rightarrow b\bar{b})$. The corresponding limit expected in the absence of signal is 1.3. The ratio of the measured signal strength to the SM expectation is found to be $\mu = 0.2\pm$0.5(stat.)$\pm$0.4(syst.). The analysis procedure is validated by a measurement of the yield of $(W/Z)Z$ production, with $Z\rightarrow b\bar{b}$, from which the ratio of the observed signal strength to the SM expectation is found to be $\mu_{VZ} = 0.9\pm 0.2$.