What question did this study set out to answer?

The aim is to refine the Standard Model Effective Field Theory (SMEFT) constraints using collider data.

February 2, 2026Open Access

Constraining the SMEFT at present and future colliders

Key Points

The aim is to refine the Standard Model Effective Field Theory (SMEFT) constraints using collider data.
Conducted a global SMEFT fit using Higgs, top quark, and diboson production data from the LHC.
Included recent LHC Run II measurements and electroweak precision observables from LEP and SLD.
Projected future measurements from the HL-LHC and proposed high-energy circular e+e- colliders.
Updated SMEFT fits show improved constraints from recent LHC data.
Predicted potential of FCC-ee and CEPC colliders to further enhance bounds on SMEFT parameters.

Abstract

We present results from SMEFiT3. 0, a global SMEFT fit of Higgs, top quark, and diboson production data from the LHC. Our updated analysis includes recent inclusive and differential measurements from the LHC Run II, together with the exact implementation of electroweak precision observables (EWPOs) from LEP and SLD. We then analyse the impact of HL-LHC measurements by adding to SMEFiT3. 0 the projections obtained by extrapolating from Run II data. Finally we estimate the potential of two proposed high-energy circular e^+e^- e + e − colliders, the FCC-ee and the CEPC, in further improving the bounds on the SMEFT parameters.

Constraining the SMEFT at present and future colliders

Key Points

Abstract

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