Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC
Name
PhysRevD.92.092001.pdf
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1012.37 KB
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Checksum (MD5)
1f832c71d3b303a3757d75f4169e28ea
Author(s)
Taylor, Frank E.
Date Issued
November 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aad, G., B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, O. S. AbouZeid, et al. “Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC.” Phys. Rev. D 92, no. 9 (November 3, 2015). © 2015 CERN, for the ATLAS Collaboration
Version
Final published version
Abstract
This paper presents a search for Higgs bosons decaying to four leptons, either electrons or muons, via one or two light exotic gauge bosons Z[subscript d], H → ZZ[subscript d] → 4ℓ or H → Z[subscript d]Z[subscript d] → 4ℓ. The search was performed using pp collision data corresponding to an integrated luminosity of about 20 fb[superscript −1] at the center-of-mass energy of √s = 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. The observed data are well described by the Standard Model prediction. Upper bounds on the branching ratio of H → ZZ[subscript d] → 4ℓ and on the kinetic mixing parameter between the Z[subscript d] and the Standard Model hypercharge gauge boson are set in the range (1–9) × 10[superscript −5] and (4–17) × 10[superscript −2] respectively, at 95% confidence level assuming the Standard Model branching ratio of H → ZZ[superscript ∗] → 4ℓ, for Z[subscript d] masses between 15 and 55 GeV. Upper bounds on the effective mass mixing parameter between the Z and the Z[subscript d] are also set using the branching ratio limits in the H → ZZ[subscript d] → 4ℓ search, and are in the range (1.5–8.7) × 10[superscript −4] for 15 < mZ[subscript d] < 35 GeV. Upper bounds on the branching ratio of H → Z[subscript d]Z[subscript d] → 4ℓ and on the Higgs portal coupling parameter, controlling the strength of the coupling of the Higgs boson to dark vector bosons are set in the range (2–3) × 10[superscript −5] and (1–10) × 10[superscript −4] respectively, at 95% confidence level assuming the Standard Model Higgs boson production cross sections, for Z[subscript d] masses between 15 and 60 GeV.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.92.092001
