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arXiv · 2008.13725

High-Temperature Electroweak Symmetry Breaking by SM Twins

Oleksii Matsedonskyi
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Abstract

We analyse a possible adjustment of Twin Higgs models allowing to have broken electroweak (EW) symmetry at all temperatures below the sigma-model scale $\sim 1$TeV. The modification consists of increasing the Yukawa couplings of the twins of light SM fermions. The naturalness considerations then imply a presence of relatively light electroweak-charged fermions, which can be produced at the LHC, and decay into SM gauge and Higgs bosons and missing energy. Analysis of experimental bounds shows that such a modified model features an increased amount of fine-tuning compared to the original Twin Higgs models, but still less tuning than the usual pseudo-Nambu-Goldstone Higgs models not improved by $Z_2$ symmetry. The obtained modification in the evolution of the EW symmetry breaking strength can, in particular, have interesting implications for models of EW baryogenesis, which we comment on.

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Oleksii Matsedonskyi. 2020-08-31. High-Temperature Electroweak Symmetry Breaking by SM Twins. https://doi.org/10.1007/jhep04(2021)036

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