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arXiv · 1609.08127

Prospects for three-body Higgs boson decays into extra light scalars

Alexander J. Helmboldt·Manfred Lindner
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Abstract

Within models containing a very light scalar particle coupled to the 125 GeV Higgs boson, we present the first detailed study of Higgs decays into three of these light scalars. We determine model-independent conditions which the scalar sector after electroweak symmetry breaking has to satisfy in order for the three-body channel to become relevant. Using a specific model -- the real scalar singlet-extension of the Standard Model (SM) -- we then identify scenarios, where the rates of scalar three-body Higgs decays are comparable to or even exceed those of the well-studied two-body channel. All those scenarios are shown to be compatible with current experimental and theoretical constraints. We finally argue that scalar three-body Higgs decays lead to exciting new collider signatures with six SM fermions in the final state. Calculating the corresponding event rates, we find that e.g. six-muon or six-tau final states may be in reach of dedicated searches at the LHC or ILC experiments.

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Alexander J. Helmboldt, Manfred Lindner. 2016-09-26. Prospects for three-body Higgs boson decays into extra light scalars. https://doi.org/10.1103/physrevd.95.055008

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