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arXiv · 2204.06966

Two Higgs doublets, Effective Interactions and a Strong First-Order Electroweak Phase Transition

Anisha·Lisa Biermann·Christoph Englert·Margarete Mühlleitner
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Abstract

It is well-known that type II two Higgs doublet models (2HDMs) can struggle to facilitate a strong first-order electroweak phase transition in the early universe whilst remaining theoretically appealing scenarios for many reasons. We analyse this apparent shortfall from the perspective of additional new physics. Starting from a consistent dimension-6 effective field theory Higgs potential extension, we identify the Higgs potential extensions that provide the necessary additional contributions required to achieve a strong first-order electroweak phase transition and trace their phenomenological implications for the Large Hadron Collider. In passing, we critically assess the reliability of the dimension-6 approximation depending on the expected 2HDM phenomenology. In particular, we focus on the role of Higgs pair production (resonant and non-resonant) and interference effects expected in top final states, which are the prime candidates of 2HDM exotics discoveries.

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Anisha, Lisa Biermann, Christoph Englert, Margarete Mühlleitner. 2022-04-14. Two Higgs doublets, Effective Interactions and a Strong First-Order Electroweak Phase Transition. https://arxiv.org/abs/2204.06966

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