# Münster 2017 – wissenschaftliches Programm

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# T: Fachverband Teilchenphysik

## T 20: Beyond the Standard Model (Theorie) 1

### T 20.2: Vortrag

### Montag, 27. März 2017, 17:00–17:15, VSH 19

**Prospects for three-body Higgs decays into extra light scalars** — •Alexander Helmboldt and Manfred Lindner — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Within models containing a very light scalar particle coupled to the 125 GeV Higgs boson, I will present the first study of Higgs decays into *three* of these light scalars.
I will introduce 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 have identified 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 were shown to be compatible with current experimental and theoretical constraints.
I will finally argue that scalar three-body Higgs decays lead to exciting new collider signatures with *six* SM fermions in the final state. In particular, I will demonstrate that e.g. six-muon or six-tau final states may be in reach of dedicated searches at the LHC or ILC experiments.