The Importance of Flavor in SMEFT Electroweak Precision Fits

Abstract

Effective field theory tools are essential for exploring non-Standard Model physics at the LHC in the absence of the discovery of new light particles. Predictions for observables are typically made at the lowest order in the QCD and electroweak expansions in the Standard Model effective field theory (SMEFT) and often ignore the effects of flavor. Here, we present results for electroweak precision observables (EWPOs)at the next-to-leading order QCD and electroweak expansions (NLO) of the SMEFT with an arbitrary flavor structure for the fermion operators. Numerical NLO SMEFT fits toEWPOs have a strong dependence on the assumed flavor structures and we demonstrate this using various popular assumptions for flavor symmetries.

arXiv commentSupplemental files contain numerical results for EWPOs, $H\to \gamma \gamma$ and $H\to Z\gamma$ at NLO QCD and electroweak order in SMEFT for arbitrary flavor structures. Version to be published in JHEP, V3: Minor correction to NLO results for CHd and CHq1 in ancilliary file EWPO_Numerical_Results_NLO.txt

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