Spurion-based EFTs are exactly equivalent to EFTs restricted to the residual symmetry preserved by a generic spurion vacuum expectation value, at all mass dimensions when all spurion powers are kept.
Baryon Number, Lepton Number, and Operator Dimension in the SMEFT with Flavor Symmetries
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abstract
For a large set of flavor symmetries, the lowest-dimensional baryon- or lepton-number violating operators in the Standard Model effective field theory (SMEFT) with flavor symmetry are of mass dimension 9. As a consequence, baryon- and lepton-number violating processes are further suppressed with the introduction of flavor symmetries, e.g., the allowed scale associated with proton decay is typically lowered to $10^5$ GeV, which is significantly lower than the GUT scale. To illustrate these features, we discuss Minimal Flavor Violation for the Standard Model augmented by sterile neutrinos.
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Most general EFTs from spurion analysis: Hilbert series and Minimal Lepton Flavor Violation
Spurion-based EFTs are exactly equivalent to EFTs restricted to the residual symmetry preserved by a generic spurion vacuum expectation value, at all mass dimensions when all spurion powers are kept.