Speaker
Description
Recently, the ATLAS and CMS collaborations have accumulated growing statistics on processes involving the production of two or more electroweak (EW) bosons, such as HH and WWZ. These multi-boson final states play a crucial role in probing the structure of the EW symmetry-breaking sector and exploring its possible extensions within the framework of Effective Field Theories (EFTs), both in the linear (SMEFT) and non-linear (HEFT) realizations. It is well known that SMEFT constitutes a specific limit of HEFT, where correlations among Wilson coefficients arise. These correlations can be experimentally tested through the study of multi-boson production channels.
Furthermore, if the Standard Model (SM) is embedded in a larger symmetry group that undergoes spontaneous breaking, the resulting (pseudo)-Goldstone bosons can produce observable effects in SM processes. Such effects can be systematically investigated within the framework of the ALP EFT, taking into account both linear and non-linear realizations of EW symmetry breaking.
This presentation will provide an overview of comprehensive results on multi-boson production within both SMEFT and HEFT, together with the corresponding constraints derived from current experimental data. It will also include a discussion of a global fit of ALP parameters in the linear scenario using ATLAS and CMS multi-boson measurements, as well as an analysis of the non-linear case.