  We study the effect of higher dimension operators on the electroweak finite
temperature phase transition in two sectors of the Standard Model. Firstly, the
Higgs-Yukawa sector, consisting of the Higgs doublet and the massive Standard
Model fermions, is studied with an approximate method, Extended Mean Field
Theory. Secondly, the gauge-Higgs sector, consisting of the Higgs doublet and
the gauge fields of the weak interaction, is studied using Monte Carlo
simulations. In both cases we find that a cutoff scale of around 1.5 TeV is
needed to make the electroweak phase transition first order at the experimental
value of the Higgs boson mass, which is a requirement for making electroweak
baryogenesis viable.
