Electroweak Symmetry Breaking

Standard Model Power Counting
Since we no longer have an infinite series in the expansion of Σ, we
may rather extract the factor 1/v and assign φ the mass dimension
1 (instead of zero). This turns all marginal operators with Σ
factors into irrelevant operators.
⇒ Anomalous couplings get a natural prefactor (m H /Λ) n , if the
Lagrangian term contains n factors of Σ.
⇒ The custodial-symmetry violating terms get extra factors of
(m H /Λ) due to the Σ factors in the T definition
⇒ Either m H is small, or Λ is large, or both. Incidentally, with
zero anomalous couplings the model (the Standard Model) is
renormalizable, so the anomalous couplings are not needed as
counterterms.