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arXiv · 2311.06353

Effective 2HDM Yukawa Interactions and a Strong First-Order Electroweak Phase Transition

Anisha·Duarte Azevedo·Lisa Biermann·Christoph Englert·Margarete Mühlleitner
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Abstract

The top quark as the heaviest particle in the Standard Model (SM) defines an important mass scale for Higgs physics and the electroweak scale itself. It is therefore a well-motivated degree of freedom which could reveal the presence of new interactions beyond the SM. Correlating modifications of the top-Higgs interactions in the 2-Higgs-Doublet Model (2HDM), we analyse effective field theory deformations of these interactions from the point of view of a strong first-order electroweak phase transition (SFOEWPT). We show that such modifications are compatible with current Higgs data and that an SFOEWPT can be tantamount to a current overestimate of exotic Higgs searches' sensitivity at the LHC in $t\bar t$ and four top quark final states. We argue that these searches remain robust from the point of accidental signal-background interference so that the current experimental strategy might well lead to 2HDM-like discoveries in the near future.

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Anisha, Duarte Azevedo, Lisa Biermann, Christoph Englert, Margarete Mühlleitner. 2023-11-10. Effective 2HDM Yukawa Interactions and a Strong First-Order Electroweak Phase Transition. https://arxiv.org/abs/2311.06353

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