Combined measurements of the mass and signal strength of the Higgs-like boson with the ATLAS detector using up to 25 fb$^{-1}$ of proton-proton collision data

An update is presented of the measurement of the properties of the newly discovered boson using the the full $pp$ collision data sample recorded by the ATLAS experiment at the LHC for the channels $H\rightarrow\,\gamma\gamma$ and $H \rightarrow ZZ^{(*)} \rightarrow 4l$, corresponding to integrated luminosities of about 4.8 fb$^{-1}$ at $\sqrt{s}=7\,$TeV and 20.7 fb$^{-1}$ at $\sqrt{s}=8\,$TeV. The combined mass measurement derived from the $H\rightarrow\,\gamma\gamma$ and $H \rightarrow ZZ^{(*)} \rightarrow 4l$ channels is $m_H=125.5 \pm 0.2\,\text{(stat)}\, ^{+0.5}_{-0.6}\,\text{(sys)}\,$GeV. The combination of all final states, including the $H \rightarrow \tau^+\tau^-$ and $H \rightarrow b\bar{b}$ channels using data corresponding to integrated luminosity of about 4.8 fb$^{-1}$ at $\sqrt{s}=7\,$TeV and 13 fb$^{-1}$ at $\sqrt{s}=8\,$TeV and the $H \rightarrow WW^{(*)} \rightarrow l\nu l\nu$ channel using data corresponding to an integrated luminosity of 13 fb$^{-1}$ at $\sqrt{s}=8\,$TeV, is reported in terms of the combined signal strength ($\mu$) and production and decay mode specific signal strengths. The combined signal strength is determined to be $\mu = 1.43 \pm 0.16\,\text{(stat)}\pm 0.14\,\text{(sys)}$ at a mass of $125.5$ GeV.