Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC

A search for the Standard Model Higgs boson in proton-proton collisions with the ATLAS detector at the LHC is presented. The datasets used correspond to integrated luminosities of approximately 4.8~\ifb\ collected at $\sqrt{s}=7$,TeV in 2011 and 5.8~\ifb\ at $\sqrt{s}=8$,TeV in 2012. Individual searches in the channels \htollll, \hgg\ and $\hWWenmun$ in the 8,TeV data are combined with previously published results of searches for $H{\rightarrow\,}ZZ^{(*)}$, $WW^{(*)}$, \bbbar\ and $\tau^+\tau^-$ in the 7,TeV data and results from improved analyses of the \htollll\ and \hgg\ channels in the 7,TeV data. Clear evidence for the production of a neutral boson with a measured mass of $\massresultStatSys$ is presented. This observation, which has a significance of 5.9 standard deviations, corresponding to a background fluctuation probability of $1.7\times 10^{-9}$, is compatible with the production and decay of the Standard Model Higgs boson