Constraining the SMEFT at Present and Future Colliders

TL;DR

This paper updates constraints on the Standard Model Effective Field Theory (SMEFT) using recent LHC data, incorporates electroweak precision measurements, and evaluates future collider prospects for improving these bounds.

Contribution

It provides the latest global SMEFT fit including recent measurements and projects the impact of future colliders like HL-LHC, FCC-ee, and CEPC on SMEFT parameter constraints.

Findings

Updated SMEFT bounds with recent LHC data

Projected improvements from HL-LHC measurements

Estimated potential of FCC-ee and CEPC in constraining 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 $e^+e^-$ colliders, the FCC-ee and the CEPC, in further improving the bounds on the SMEFT parameters.