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  • Open Access

Phase diagram of the standard model effective field theory

Mikael Chala*, Maria Cristina Fiore†, and Luis Gil‡

  • *Contact author: mikael.chala@ugr.es
  • †Contact author: mcristinafiore@ugr.es
  • ‡Contact author: lgil@ugr.es

Phys. Rev. D 113, 115061 – Published 25 June, 2026

DOI: https://doi.org/10.1103/zxzs-d6zt

Abstract

We perform dimensional reduction of the dimension-6 standard model effective field theory (SMEFT) to order g4 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 provide evidence that, in contrast with previous statements in the literature, the SMEFT may undergo a first-order phase transition even for null |ϕ|6 at zero temperature—where ϕ is the Higgs doublet—opening the door to entirely unexplored directions in model building. In such case, however, our analysis implies that the phase transition is not sufficiently strong, narrowing down the new physics that allows for electroweak baryogenesis.

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