Search for Higgs Boson Decays to Beyond-The-Standard-Model Light Bosons in Four-Lepton Events with the ATLAS Detector at √s=13 TeV


A search is conducted for a beyond-the-Standard-Model boson using events where a Higgs boson with mass 125 GeV decays to four leptons (ℓ = e or μ). This decay is presumed to occur via an intermediate state which contains one or two on-shell, promptly decaying bosons: H → ZX/XX → 4ℓ, where X is a new vector boson Z_d or pseudoscalar α with mass between 1 and 60 GeV. The search uses pp collision data collected with the ATLAS detector at the LHC with an integrated luminosity of 36.1 fb⁻¹ at a centre-of-mass energy √s=13 TeV. No significant excess of events above Standard Model background predictions is observed; therefore, upper limits at 95% confidence level are set on modelindependent fiducial cross-sections, and on the Higgs boson decay branching ratios to vector and pseudoscalar bosons in two benchmark models. ©2018 CERN, for the ATLAS Collaboration



Proton-proton interactions, Leptons (Nuclear physics), Monte Carlo method, Standard model (Nuclear physics), Hadrons--Scattering, Higgs bosons, Large Hadron Collider (France and Switzerland)


CC BY 4.0 (Attribution), ©2018 CERN, for the ATLAS Collaboration