Speaker
Description
A combined measurement of processes in which a top-quark is produced in association with additional particles using the full Run 2 dataset collected by the ATLAS experiment at the LHC is presented. The results are interpreted within the framework of the Standard Model Effective Field Theory (SMEFT), allowing constraints to be placed on dimension-six, top-sector operators.
ATLAS top-quark measurements provide uniquely powerful sensitivity to physics beyond the Standard Model due to the top-quark's unique position as the heaviest fundamental particle, the diverse set of final states, the exceptionally large dataset collected, and the high experimental precision achieved in Run 2. This analysis combines multiple top+X processes in a single, global fit, exploiting correlations and interplays between processes and SMEFT effects. All relevant SMEFT operators are included simultaneously, ensuring a consistent and comprehensive interpretation of the data. This approach aims to set competitive limits on top-sector SMEFT coefficients and highlights the importance of combining all available ATLAS top data to robustly probe new physics effects.