 With one or more electroweak Higgs doublets in the Higgs sector, the effective action term formula_5 which generically arises with physics beyond the Standard Model at the scale Λ contributes to the Peskin–Takeuchi parameter T.

Current precision electroweak measurements restrict Λ to more than a few TeV.Attempts to solve the gauge hierarchy problem generically require the addition of new particles below that scale, however.Before electroweak symmetry breaking there was a global SU(2)xSU(2) symmetry in higgs potential which was broken to SU(2) after electroweak symmetry breaking.