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arXiv · 2103.07467

Singlet-assisted electroweak phase transition at two loops

Lauri Niemi·Philipp Schicho·Tuomas V. I. Tenkanen
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Abstract

We investigate the electroweak phase transition in the real-singlet extension of the Standard Model at two-loop level, building upon existing one-loop studies. We calculate the effective potential in the high-temperature approximation and detail the required resummations at two-loop order. In typical strong-transition scenarios, we find deviations of order $20\% - 50\%$ from one-loop results in transition strength and critical temperature for both one- and two-step phase transitions. For extremely strong transitions, the discrepancy with one-loop predictions is even larger, presumably due to sizable scalar couplings in the tree-level potential. Along the way, we obtain a dimensionally-reduced effective theory applicable for non-perturbative lattice studies of the model.

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Lauri Niemi, Philipp Schicho, Tuomas V. I. Tenkanen. 2021-03-12. Singlet-assisted electroweak phase transition at two loops. https://doi.org/10.1103/physrevd.103.115035

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