Exact SMEFT formulation and expansion to O(ν44)

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The Standard Model Effective Field Theory (SMEFT) theoretical framework is increasingly used to interpret particle physics measurements and constrain physics beyond the Standard Model. We investigate the truncation of the effective-operator expansion using the geometric formulation of the SMEFT, which allows exact solutions, up to mass-dimension eight. Using this construction, we compare the exact solution to the expansion at O(v(2)/Lambda (2)), partial O(v(4)/Lambda (4)) using a subset of terms with dimension-6 operators, and full O(v(4)/Lambda (4)), where v is the vacuum expectation value and Lambda is the scale of new physics. This comparison is performed for general values of the coefficients, and for the specific model of a heavy U(1) gauge field kinetically mixed with the Standard Model. We additionally determine the input-parameter scheme dependence at all orders in v/Lambda, and show that this dependence increases at higher orders in v/Lambda.

Original languageEnglish
Article number87
JournalJournal of High Energy Physics
Volume2020
Issue number11
Number of pages47
ISSN1029-8479
DOIs
Publication statusPublished - 17 Nov 2020

    Research areas

  • Beyond Standard Model, Effective Field Theories, INFRARED SINGULARITIES, HIGGS

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