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Overview of Higgs boson results at ATLAS experiment at the LHC

One year ago, a new particle with the mass of 125 GeV and properties expected for the Standard Model Higgs boson was discovered by ATLAS and CMS experiments at the Large Hadron Collider at CERN in proton-proton collisions at center-of-mass energies $\sqrt{s}=$7 TeV and 8 TeV. Since that time more da...

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Detalles Bibliográficos
Autor principal: Tsukerman, I
Lenguaje:eng
Publicado: 2013
Materias:
Acceso en línea:http://cds.cern.ch/record/1635153
Descripción
Sumario:One year ago, a new particle with the mass of 125 GeV and properties expected for the Standard Model Higgs boson was discovered by ATLAS and CMS experiments at the Large Hadron Collider at CERN in proton-proton collisions at center-of-mass energies $\sqrt{s}=$7 TeV and 8 TeV. Since that time more data at 8 TeV were accumulated and analyzed and a progress was reached in the measurement of the particle properties. In this note an overview of Higgs boson results obtained recently at ATLAS experiment is given. Complete dataset which corresponds to 4.7 fb$^{-1}$ (20.5 fb$^{-1}$) of the data obtained at 7 TeV (8 TeV) collisions, respectively, is used. The following five signal decay channels are considered: $H\rightarrow\gamma\gamma$, $H\rightarrow ZZ^{\star}\rightarrow \ell\ell\ell\ell$, $H\rightarrow WW^{\star}\rightarrow\ell\ell\nu\nu$, $H\rightarrow\tau\tau$ and $H\rightarrow b\bar{b}$. These channels are combined to extract Higgs boson signal mass, strength, coupling constants, spin and parity. All experimental results obtained are compatible with the Standard Model predictions. In addition, upper bounds on the Higgs boson production cross section in rare decay modes ($H\rightarrow\mu\mu$ and $H\rightarrow Z\gamma^{\star})$ are obtained.