Exact SMEFT formulation and expansion to O(ν4/λ4)
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- Hays2020_Article_ExactSMEFTFormulationAndExpans
Final published version, 2.4 MB, PDF document
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 language | English |
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Article number | 87 |
Journal | Journal of High Energy Physics |
Volume | 2020 |
Issue number | 11 |
Number of pages | 47 |
ISSN | 1029-8479 |
DOIs | |
Publication status | Published - 17 Nov 2020 |
- Beyond Standard Model, Effective Field Theories, INFRARED SINGULARITIES, HIGGS
Research areas
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