Hot news on the phase structure of the SMEFT

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 $|\varphi {|}^6$ at zero temperature, where $\varphi$ is the Higgs doublet. This opens the door to entirely unexplored directions in model building.

arXiv comment9 pages, 4 figures. Updated small changes to plots in Figures 1 and 2. Conclusions unchanged

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