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<p>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 <i>v</i> or in terms of two scales <i>v</i> &lt; <i>f</i>, 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.</p>

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The Art of Counting: a reappraisal of the HEFT expansion

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月24日

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  • Ilaria Brivio,
  • Ramona Gröber,
  • Konstantin Schmid

摘要

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 v or in terms of two scales v < f, 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.