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EW Extensions of the Standard Model and the Suppression of Fermionic EFT Interactions

The low-energy effective field theory for electroweak (EW) interactions is studied here. It embeds the Standard Model (SM) as a particular limit and parametrizes new physics deviations. We discuss some experimental resonant diboson searches and four-fermion operator analyses that seem to push the new physics scale well over the TeV. On the other hand, the more precise oblique parameter determinations allow new physics resonances in the few TeV range. This apparent contradiction is easily solved by postulating a Standard Model extension that only couples directly to the bosonic degrees of freedom of the Standard Model but not to its fermions.