Search for a SM Higgs boson in the $H \rightarrow Z^*Z \rightarrow \ell^{+}\ell^{-}q\bar{q}$ channel in the mass range 120 - 180 GeV with the ATLAS Detector at $\sqrt{s} = 7$ TeV

A summary of the first study is given for the decay channel $H \rightarrow Z^*Z \rightarrow \ell^+\ell^-q\bar{q} (l=e,mu)$ in the Higgs boson mass range 120 - 180 GeV, using the $pp$ collision data collected by the ATLAS experiment at $\sqrt{s} = 7$ TeV at the LHC. Data driven methods to estimate the background and new techniques to improve the mass resolution of the hadronic $Z$ boson decay are used. Events with 0 or 1 $b$-jets and events with 2 $b$-jets are treated as separated channels. No significant excess of events above the estimated background is observed; upper limits at 95% C.L. on the Higgs production cross section are derived.