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arXiv · 2507.16905

Hot news on the phase structure of the SMEFT

Mikael Chala·Maria Cristina Fiore·Luis Gil
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Abstract

We perform dimensional reduction of the electroweak sector of the dimension-six SMEFT to order $g^4$ in coupling constants $g$. This analysis includes one-loop contributions to kinetic terms and quartic couplings; as well as two-loop contributions, where operators such as four-fermion interactions first appear, to squared mass terms. Using lattice data, we also provide evidence that, in contrast with previous statements in the literature, the SMEFT may undergo a first-order phase transition even for null $|\phi|^6$ at zero temperature, where $\phi$ is the Higgs doublet. This opens the door to entirely unexplored directions in model building.

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Mikael Chala, Maria Cristina Fiore, Luis Gil. 2025-07-22. Hot news on the phase structure of the SMEFT. https://doi.org/10.1103/zxzs-d6zt

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