Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
Name
Constraints on new.pdf
Size
1.01 MB
Format
Adobe PDF
Checksum (MD5)
aaac6df67447f338117ee72f94782a47
Author(s)
Taylor, Frank E
Date Issued
November 2013
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag/SISSA
Citation
The ATLAS collaboration et al. “Constraints on New Phenomena via Higgs Boson Couplings and Invisible Decays with the ATLAS Detector.” Journal of High Energy Physics 2015.11 (2015): n. pag.
Version
Final published version
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[superscript −1] of pp collision data at √s= 7 TeV and 20.3 fb[superscript −1] at √s=8 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1007/JHEP11(2015)206
