Higgs Squared
Csaba Csaki, Ameen Ismail, Maximilian Ruhdorfer, Joseph Tooby-Smith

TL;DR
This paper introduces a new Higgs-VEV sensitive operator within an extended two Higgs doublet model, reducing tuning in cosmic selection models for the electroweak hierarchy problem and enabling novel neutrino mass mechanisms.
Contribution
It presents a unique operator construction based on a 2HDM with a softly broken $D_8$ symmetry, reducing tuning and connecting to neutrino mass generation.
Findings
Operator reduces tuning in hierarchy models
Model naturally approaches the alignment limit
Extended Higgs sector enables a new neutrino seesaw mechanism
Abstract
We present a novel construction for a Higgs-VEV sensitive operator, which can be used as a trigger operator in cosmic selection models for the electroweak hierarchy problem. Our operator does not contain any degrees of freedom charged under the SM gauge symmetries, leading to reduced tuning in the resulting models. Our construction is based on the extension of a two Higgs doublet model (2HDM) with a softly broken approximate global symmetry (the symmetry group of a square). A cosmic crunching model based on our extended Higgs sector has only a percent level tuning corresponding to the usual little hierarchy problem. In large regions of parameter space the 2HDM is naturally pushed towards the alignment limit. A complete model requires the introduction of fermionic top partners to ensure the approximate symmetry in the fermion sector. We also show that the same extended Higgs…
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Dark Matter and Cosmic Phenomena · Neutrino Physics Research
