EFTatLHC

The Large Hadron Collider (LHC) at CERN has opened a new era in the exploration of the fundamental laws of Nature. It will be the world’s energy frontier machine for the foreseeable future, and the question of what lies beyond the Standard Model (SM) of particle physics is the primary target of its physics program. Effective field theories (EFTs) provide a unified, model-independent framework to address this question, that can make use of measurements from the full spectrum of LHC physics and beyond. This project aims to develop EFT measurements within ATLAS and with the wider particle physics community, including the widest possible spectrum of measurements in LHC Run 3 data. These will include in particular ATLAS measurements involving Higgs bosons, top quarks, pairs of W and Z bosons and the Drell-Yan process. The results of measurements outside ATLAS will also be included to achieve the strongest possible constraints. The project will focus on improving the EFT sensitivity of these analyses, establishing their EFT interpretations, and performing wide combinations of results (both within and outside ATLAS) to obtain the strongest possible constraints on EFT parameters. Combinations outside the scope of ATLAS alone will require the ability to efficiently exchange information within the wider particle physics community, in particular on statistical models. The development of methods, standards and tools toward this goal, following FAIR principles, will constitute a key part of the project. The consortium involves teams from the LAPP (Annecy), IJCLab (Orsay), LPC (Clermont-Ferrand) and LPSC (Grenoble) laboratories of IN2P3, as well as external partners from the universities of Valencia (Spain), Heidelberg (Germany), New York (United States) and CERN (Switzerland). Its members provide strong expertise in ATLAS measurements with EFT sensitivity, the reinterpretation of LHC analysis results, the theory framework of EFT measurements and global fits of EFT results.