Seminarium "Teoria cząstek elementarnych i kosmologia"

With the discovery of a scalar resonance at ATLAS and CMS, the understanding of the electroweak symmetry breaking sector seems a much closer goal. Theories of New Physics where the electroweak symmetry breaking occurs linearly describe different deviations from the SM predictions with respect to theories where the electroweak symmetry breaking is non-linearly realised. I will review and compare the effective Lagrangians of the linear and non-linear realisations, dubbed SMEFT and HEFT respectively, and discuss some phenomenological signals that may lead to disentangle between the two possibilities.