A2a: The effective electroweak Lagrangian in the light of the LHC

In this project we will use the Standard Model Effective Field Theory (SMEFT) to analyse the LHC Run 3 data and confront them with theoretical predictions in the Higgs, electroweak and top sectors. We shall perform global fits in the SMEFT framework with the SFitter tool, which allows a comprehensive treatment of uncertainties and has the flexibility to incorporate a wide range of generic LHC measurements. The global fit of the upcoming LHC data will include new sets of measurements, in particular kinematic distributions, and a refined treatment of uncertainties in the Bayesian framework. A particular focus will be on the interplay between the SMEFT description and specific models, to explore the complementarity of SMEFT and model-specific searches for New Physics.

1. EFT description and consistency: systematic test of SMEFT consistency at the LHC; effective Lagrangian: CP or custodial symmetries, truncation, combination with electroweak results from LHC, fermionic operators, combination with electroweak precision data, S-parameter, interference between bosonic and fermionic operators, treatment of weak boson decays, relation to UV-complete models, EFT representing model classes;
2. Global analysis: implementation of full kinematic information with uncertainties; treatment of correlated theoretical uncertainties comparison of Bayesian and likelihood methods; interpretation of multi-variate analyses; interface to published experimental likelihoods; comparison of Markov chain with NN methods.