The automation of SMEFT-Assisted Constraints on UV-Complete Models

On this page, we collect additional results we obtained on the constraints of UV models matched to the SMEFT as presented in:

The automation of SMEFT-Assisted Constraints on UV-Complete Models, J. ter Hoeve, G.Magni, J. Rojo, A. N. Rossia and E. Vryonidou [tHMR+23]

Using both tree-level and one-loop matching, we derive bounds on a wide range of single- and multi-particle extensions of the SM from a global dataset composed by LHC and LEP measurements. Whenever possible, we benchmark our results with existing studies. Our framework realises one of the main objectives of the EFT program in particle physics: deploying the SMEFT to bypass the need of directly comparing the predictions of UV models with experimental data.

The table below provides for each combination of the perturbative QCD order (LO/NLO) and the order in the EFT (linear/quadratic), a comparison of the posterior distributions of the UV-invariants:

Posterior distributions of the UV couplings
	LO QCD	NLO QCD	\(\mathcal{O}\left(\Lambda^{-2}\right)\)	\(\mathcal{O}\left(\Lambda^{-4}\right)\)
Heavy scalars	`Linear vs quadratic`	`Linear vs quadratic`	`LO vs NLO`	`LO vs NLO`
Heavy fermions	`Linear vs quadratic`	`Linear vs quadratic`	`LO vs NLO`	`LO vs NLO`
Heavy bosons	`Linear vs quadratic`	`Linear vs quadratic`	`LO vs NLO`	`LO vs NLO`
Multi-particle	`Linear vs quadratic`	`Linear vs quadratic`	`LO vs NLO`	`LO vs NLO`
One-loop	`Linear vs quadratic`	`Linear vs quadratic`	`LO vs NLO`	`LO vs NLO`

Requests for variants of these fits should be addressed to the SMEFiT authors.