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arXiv · 1309.0819

Naive Dimensional Analysis Counting of Gauge Theory Amplitudes and Anomalous Dimensions

Elizabeth E. Jenkins·Aneesh V. Manohar·Michael Trott
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Abstract

We show that naive dimensional analysis (NDA) is equivalent to the result that L-loop scattering amplitudes have perturbative order N=L+Delta, with a shift Delta that depends on the NDA-weight of operator insertions. The NDA weight of an operator is defined in this paper, and the general NDA formula for perturbative order N is derived. The formula is used to explain why the one-loop anomalous dimension matrix for dimension-six operators in the Standard Model effective field theory has entries with perturbative order ranging from 0 to 4. The results in this paper are valid for an arbitrary effective field theory, and they constrain the coupling constant dependence of anomalous dimensions and scattering amplitudes in a general effective field theory.

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Elizabeth E. Jenkins, Aneesh V. Manohar, Michael Trott. 2013-09-03. Naive Dimensional Analysis Counting of Gauge Theory Amplitudes and Anomalous Dimensions. https://doi.org/10.1016/j.physletb.2013.09.020

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