The Higgs Portal from LHC to ILC
Christoph Englert

TL;DR
This paper explores how mixing between the Higgs boson and a hidden sector affects Higgs search results at the LHC and ILC, emphasizing the importance of measuring invisible decays to identify potential deviations from the Standard Model.
Contribution
It introduces a model of Higgs-hidden sector mixing and discusses how future colliders can help detect invisible decay modes to confirm such scenarios.
Findings
LHC bounds can be interpreted in terms of Higgs-hidden mixing
Invisible decays are crucial for identifying deviations from the Standard Model
Future linear colliders are essential for precise measurements of invisible Higgs decays
Abstract
Interpretations of searches for the Higgs boson are governed by model-dependent combinations of Higgs production cross sections and Higgs branching ratios. Mixing of the Higgs doublet with a hidden sector captures modifications from the Standard Model Higgs phenomenology in the standard search channels in a representative way, in particular because invisible Higgs decay modes open up. As a consequence, LHC exclusion bounds, which disfavor a heavy Standard Model Higgs can be consistently understood in terms of a standard-hidden mixed Higgs system. Shedding light on the possible existence of such an admixture with a hidden sector and quantifying the resemblance of an eventually discovered scalar resonance with the Standard Model Higgs crucially depends on measurement of invisible decays. This task will already be tackled at LHC, but eventually requires the clean environment of a future…
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Black Holes and Theoretical Physics · Cosmology and Gravitation Theories
