Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector

By G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, O. AbouZeid, H. Abramowicz, H. Abreu, R. Abreu and 2,836 more. Journal of High Energy Physics, 2015

260 citations recorded by the source corpus.

The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb−1 of pp collision data at s=7\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \sqrt{s}=7 $$\end{document} TeV and 20.3 fb−1 at s=8\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \sqrt{s}=8 $$\end{document} TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the γγ, ZZ, W W , Zγ, bb, τ τ , and μμ decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. Limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the γγ and ZZ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of mA> 370 GeV in the “hMSSM” simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with W/Z (Z → ℓℓ, W/Z → jj) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. The use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e02071aa6bf3bfb7950152a44aac573db885e5b8

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Citations in the corpus

Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider (2019, background): “This possibility is well motivated because the SM Higgs field provides one of the leading renormalizable portals for new gauge-singlet particles to couple to the SM, and the experimental characterization of the Higgs boson leaves much scope for couplings of the Higgs to BSM physics [115, 116].”
Combination of searches for invisible decays of the Higgs boson using 139 fb−1 of proton-proton collision data at s=13 TeV collected with the ATLAS experiment (2023, unknown): “The statistical combination of the analyses is performed by constructing the product of their respective likelihoods and maximising the resulting proﬁle likelihood ratio [54] where β and θ are the parameter of interest and the nuisance parameters respectively .”
Combined measurements of Higgs boson production and decay using up to $80$ fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=$ 13 TeV collected with the ATLAS experiment (2019, methodology): “Its couplings to vector bosons, up-type quarks, down-type quarks and leptons relative to the corresponding SM predictions are expressed as functions of the mixing angle α between h and the heavy CP-even neutral scalar, and the ratio of the vacuum expectation values of the Higgs doublets, tan β [38].”
Update of the global electroweak fit and constraints on two-Higgs-doublet models (2018, unknown): “Similar constraints have been obtained by the ATLAS collaboration [97].”