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

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). 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. Physical review. D - particles, fields, gravitation, and cosmology, D92(9), 092001. American Physical Society 10.1103/PhysRevD.92.092001

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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 d , H→ZZ d →4ℓ or H→Z d Z d →4ℓ . The search was performed using pp collision data corresponding to an integrated luminosity of about 20 fb⁻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 d →4ℓ and on the kinetic mixing parameter between the Z d and the Standard Model hypercharge gauge boson are set in the range (1 --9)×10⁻⁵ and (4 --17)×10⁻² respectively, at 95% confidence level assuming the Standard Model branching ratio of H→ZZ ∗ →4ℓ , for Z d masses between 15 and 55 GeV. Upper bounds on the effective mass mixing parameter between the Z and the Z d are also set using the branching ratio limits in the H→ZZ d →4ℓ search, and are in the range (1.5 --8.7)×10⁻⁴ for 15<m Z d <35 GeV. Upper bounds on the branching ratio of H→Z d Z d →4ℓ and on 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)×10⁻⁵ and (1 --10)×10⁻⁴ respectively, at 95% confidence level assuming the Standard Model Higgs boson production cross sections, for Z d masses between 15 and 60 GeV.

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