Speaker
Description
Recently, the ATLAS and CMS experiments have been accumulating increasing statistics on the production of two electroweak (EW) bosons or more, such as HH and WWZ. These multi-boson final states are essential for probing the nature of the EW symmetry-breaking sector and its potential extensions within the framework of Effective Field Theories (EFTs), both in the linear realization (SMEFT) and the non-linear realization (HEFT). It is well established that SMEFT is a subset of HEFT, with the former imposing correlations among Wilson coefficients that can be tested through the study of multi-boson signatures.
Moreover, if the Standard Model (SM) is embedded in a larger symmetry group that undergoes spontaneous breaking, the resulting (pseudo)-Goldstone bosons may leave detectable imprints on SM observables. These effects can be systematically analyzed within the ALP EFT framework, considering both linear and non-linear EW symmetry-breaking scenarios.
In this talk, I will present comprehensive results on multi-boson production within both SMEFT and HEFT, along with the constraints that can be extracted from experimental data. Additionally, I will discuss a global fit of ALP parameters in the linear case using ATLAS and CMS multi-boson measurements and discuss the non-linear case.
