EFT predictions valid up to E ~ Lambda where new physics enters; truncation error ~(E/Lambda)^(d_max - 4); break-down signaled by perturbation-expansion divergence; ChPT breaks at chiral-symmetry-breaking scale ~1 GeV.
EFT predictions valid up to E ~ Lambda where new physics enters; truncation error ~(E/Lambda)^(d_max - 4); break-down signaled by perturbation-expansion divergence; ChPT breaks at chiral-symmetry-breaking scale ~1 GeV.