Below electroweak scale (~100 GeV), integrate out W/Z/Higgs/top to get WET: 4-fermion operators (e.g. C_VLL u-bar gamma_mu PL d nu-bar gamma^mu PL e for beta-decay); 80+ Wilson coefficients constrained by precision experiments.
Below electroweak scale (~100 GeV), integrate out W/Z/Higgs/top to get WET: 4-fermion operators (e.g. C_VLL u-bar gamma_mu PL d nu-bar gamma^mu PL e for beta-decay); 80+ Wilson coefficients constrained by precision experiments.