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 \( t\overline{t} \) 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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Acknowledgments
We thank Matthias Steinhauser for helpful discussions. This work was funded by a Leverhulme Trust Research Project Grant RPG-2021-031. C.E. is supported by the U.K. Science and Technology Facilities Council (STFC) under grant ST/X000605/1 and the Institute of Particle Physics Phenomenology Associateship Scheme. M.M. is supported by the BMBF-Project 05H21VKCCA.
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Anisha, Azevedo, D., Biermann, L. et al. Effective 2HDM Yukawa interactions and a strong first-order electroweak phase transition. J. High Energ. Phys. 2024, 45 (2024). https://doi.org/10.1007/JHEP02(2024)045
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DOI: https://doi.org/10.1007/JHEP02(2024)045