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arXiv · 2607.12039

Constraining the real singlet extension of the Standard Model: implications for vacuum stability

Moritz Bosse·Gudrun Hiller·Daniel Litim·Fabio Maltoni·Michael J. Ramsey-Musolf·Simone Tentori·Guotao Xia
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Abstract

Amongst the simplest extensions of the Standard Model is the addition of a real singlet scalar field with profound phenomenological consequences. The singlet can catalyze a strong first-order electroweak phase transition, necessary for successful electroweak baryogenesis. Furthermore, the current prediction of a metastable Higgs vacuum can be lifted towards absolute stability. While current data mainly constrain the scalar mixing angle, future measurements of the Higgs self-coupling and direct searches for additional scalar states will probe much larger parts of the viable parameter space. We report on a combined study of theoretical and experimental constraints on the real singlet extension, highlighting here in particular its implications for vacuum stability.

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Moritz Bosse, Gudrun Hiller, Daniel Litim, Fabio Maltoni, Michael J. Ramsey-Musolf, Simone Tentori, Guotao Xia. 2026-07-13. Constraining the real singlet extension of the Standard Model: implications for vacuum stability. https://arxiv.org/abs/2607.12039

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