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Phase diagram of the standard model effective field theory
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 in coupling constants . 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 at zero temperature—where 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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