Constraints on New Phenomena via Higgs Boson Couplings and Invisible Decays with the ATLAS Detector

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Constraints on New Phenomena via Higgs Boson Couplings and Invisible Decays with the ATLAS Detector

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Title: Constraints on New Phenomena via Higgs Boson Couplings and Invisible Decays with the ATLAS Detector
Author(s):
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdinov, O.;
Aben, R.;
Abolins, M.;
AbouZeid, O. S.;
Izen, Joseph M.;
Leyton, Michael;
Meirose, Bernhard;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2015-11-30
Format: Text
Item Type: Article
Keywords: Show Keywords
Abstract: 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 √s̅ = 7 TeV and 20.3 fb⁻¹ at √s̅ = 8 TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the γγ, ZZ, WW, Zγ, bb, ττ, 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 m{A} > 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.
Publisher: Springer
ISSN: 1029-8479
Source: Journal of High Energy Physics
Link to Related Resource: http://dx.doi.org/10.1007/JHEP11(2015)206
Persistent Link: http://hdl.handle.net/10735.1/4937
Bibliographic Citation: Aad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2015. "Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector." Journal of High Energy Physics 2015(206), doi:10.1007/JHEP11(2015)206.
Terms of Use: CC BY 4.0 (Attribution)
©2015 The Authors

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CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)