Search for an additional, heavy Higgs boson in the H → ZZ decay channel at √s = 8 TeV in pp collision data with the ATLAS detector
Name
Search for an additional.pdf
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3.3 MB
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Author(s)
Conta, C.
Dondero, P.
Ferrari, Ruggero
Fraternali, M.
Gaudio, G.
Introzzi, G.
Lanza, A.
Livan, M.
Negri, A.
Polesello, G.
Date Issued
January 2016
Journal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
Atlas Collaboration et al. “Search for an Additional, Heavy Higgs Boson in the H → Z Z Decay Channel at √s = 8 TeV in pp Collision Data with the ATLAS Detector.” The European Physical Journal C 76.1 (2016): n. pag. © 2016 CERN for the benefit of the ATLAS collaboration
Version
Final published version
Abstract
A search is presented for a high-mass Higgs boson in the H → Z Z → ℓ[superscript +]ℓ[superscript −]ℓ[superscript +]ℓ[superscript −], H → Z Z →ℓ[superscript +]ℓ[superscript −]ν[bar over ν], H → Z Z → ℓ[superscript +]ℓ[superscript −]q[bar over q], and H → Z Z → ν[bar over ν]q[bar over q] decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton–proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb[superscript −1]. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to 1 TeV for all four decay modes and down to as low as 140 GeV, depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to Z boson pairs. 95 % confidence level upper limits range from 0.53 pb at mH = 195 GeV to
0.008 pb at mH = 950 GeV for the gluon-fusion production mode and from 0.31 pb at mH = 195 GeV to 0.009 pb at mH = 950 GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of TypeI and Type-II two-Higgs-doublet models.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-015-3820-z
