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Singlet-assisted electroweak phase transition at two loops

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arxiv 2103.07467 v3 pith:U6TICPMI submitted 2021-03-12 hep-ph

Lauri Niemi , Philipp Schicho , Tuomas V.I. Tenkanen This is my paper
classification hep-ph
keywords one-loopphasetransitioneffectiveelectroweakmodelorderpotential
verification ladder T0 review T1 audit T2 compute T3 formal
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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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Cited by 5 Pith papers

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