SMEFT Constraints on New Physics Beyond the Standard Model

TL;DR

This paper discusses the use of SMEFT as a systematic, model-independent framework to analyze experimental data for signs of new physics beyond the Standard Model, based on a global fit including dimension-6 operators.

Contribution

It presents the first global fit to LHC Run 2 and earlier data using SMEFT, demonstrating how it constrains new physics scenarios and exploring potential for dimension-8 operator analysis.

Findings

Constraints on new physics from SMEFT global fit

Potential to probe dimension-8 operators

Complementarity with direct searches

Abstract

The Fermi effective theory of the weak interaction helped identify the structure of the electroweak sector of the Standard Model, and the chiral effective Lagrangian pointed towards QCD as the theory of the strong interactions. The Standard Model Effective Field Theory (SMEFT) is a systematic and model-independent framework for characterizing experimental deviations from the predictions of the Standard Model and pointing towards the structures of its possible extensions that is complementary to direct searches for new physics beyond the Standard Model. This talk summarizes results from the first global fit to data from LHC Run 2 and earlier experiments including dimension-6 SMEFT operators, and gives examples how it can be used to constrain scenarios for new physics beyond the Standard Model. In addition, some windows for probing dimension-8 SMEFT operators are also mentioned.