Higgs couplings and properties with the ATLAS detector at the LHC

A review of the latest results on the main properties of the Higgs boson using the decay channels $\ensuremath{H{\rightarrow\,}\gamma\gamma}$, $\ensuremath{H {\rightarrow\,} WW^{(\ast)}{\rightarrow\,} l\nu l \nu }$, $\ensuremath{H{\rightarrow\,}ZZ^{(\ast)}}{\rightarrow\,}4l$, $\ensuremath{H{\rightarrow\,}b\bar{b}}$ and $\ensuremath{H{\rightarrow\,}\tau\tau}$ with the ATLAS experiment at the CERN Large Hadron Collider at center-of-mass energies of $\sqrt{s}=7~\tev$ and $\sqrt{s}=8~\tev$ is presented. The analyzed dataset, collected in 2011 at center-of-mass energy of $\sqrt{s}=7~\tev$ and in 2012 at $\sqrt{s}=8~\tev$, corresponds to an integrated luminosity of approximately 25 fb$^{-1}$ of pp collisions. % The measurements discussed will be the mass, couplings properties and main quantum numbers in these channels through various production processes. The combined mass measurements using the decays channels $\ensuremath{H{\rightarrow\,}ZZ^{(\ast)}}{\rightarrow\,}4l$ and $\ensuremath{H{\rightarrow\,}\gamma\gamma}$, gives a mass value of $m_H=125.5\pm 0.2 \text{ (stat) } ^{+0.5}_{-0.6}\text{ (sys) } $. The results on the Higgs boson spin and quantum numbers obtained using all the three bosonic decay channels provide evidence for the spin$-$0 nature of the Higgs boson, with positive parity being strongly preferred. Evidence for Higgs decaying to fermions is found at $3.7\sigma$ level combining the newly available channels $\ensuremath{H{\rightarrow\,}b\bar{b}}$ and $\ensuremath{H{\rightarrow\,}\tau\tau}$. The combination of the Higgs decays channel results in a signal strength of $\mu = 1.30\pm 0.12 \text{ (stat) }^{+0.14}_{-0.11}\text{ (sys) } $ at a Higgs boson mass of $125.5$ GeV. The measurements of the production and decay mode specific signal strengths and the Higgs boson coupling determinations in various benchmark models show good agreement with the Standard Model Higgs boson hypothesis.