The Art of Counting: a reappraisal of the HEFT expansion
arXiv:2511.23410 · doi:10.1007/JHEP04(2026)202
Abstract
We revisit the power counting of the Higgs Effective Field Theory (HEFT) from first principles, by requiring that predictions for physical observables follow a series expansion in small, dimensionless quantities. Depending on whether HEFT is formulated in terms of a unique low-energy scale or in terms of two scales , this approach identifies two viable power counting rules that can accommodate any operator normalization choice. We provide quantitative prescriptions for the consistent truncation of HEFT operators, amplitudes and observable contributions and we illustrate our arguments with a number of examples.
86 pages, 10 figures, 7 tables, version published in JHEP