Measurements of the Higgs boson production and decay rates and coupling strengths using $pp$ collision data at $\sqrt{s}=7$ and $8$ TeV in the ATLAS experiment

Abstract

Combined analyses of the Higgs boson production and decay rates as well as its coupling strengths to vector bosons and fermions are presented. The combinations include the results of the analyses of the $H\to \gamma \gamma ,Z{Z}^{\ast },W{W}^{\ast },Z\gamma ,b\bar{b},\tau \tau$ and $\mu \mu$ decay modes, and the constraints on the associated production with a pair of top quarks and on the off-shell coupling strengths of the Higgs boson. The results are based on the LHC proton-proton collision datasets, with integrated luminosities of up to 4.7 ${\mathrm{fb}}^{-1}$ at $\sqrt{s}=7$ TeV and 20.3 ${\mathrm{fb}}^{-1}$ at $\sqrt{s}=8$ TeV, recorded by the ATLAS detector in 2011 and 2012. Combining all production modes and decay channels, the measured signal yield, normalised to the Standard Model expectation, is $1.18_{-0.14}^{+0.15}$. The observed Higgs boson production and decay rates are interpreted in a leading-order coupling framework, exploring a wide range of benchmark coupling models both with and without assumptions on the Higgs boson width and on the Standard Model particle content in loop processes. The data are found to be compatible with the Standard Model expectations for a Higgs boson at a mass of 125.36 GeV for all models considered.

arXiv comment69 pages plus author list + cover pages (85 pages total), 27 figures, 13 tables. Submitted to The European Physical Journal C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-06/

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• Exploring the extended scalar sector with resonances in vector boson scattering
• The Multiple Point Principle and Extended Higgs Sectors
• Sensitivity to longitudinal vector boson scattering in semileptonic final states at the HL-LHC
• GMSB with Light Stops
• Mass limits for the chiral color symmetry $G^{\prime }$-boson from LHC dijet data
• Searches for new interactions within the SMEFT framework at present and future colliders
• Constraints from Heavy Higgs boson masses in the two Higgs doublet model
• Higgs boson decay to lepton pair and photon and possible non-Hermiticity of the Yukawa interaction
• Charged Higgs-boson pair production in association with the $Z^0$ boson at electron-positron colliders