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An extension of the Standard Model Lagrangian by higher-dimension operators built from Standard Model fields and preserving its gauge symmetry, organized in inverse powers of a heavy new-physics scale. It is not obtained by integrating the Standard Model out of itself.
wp-physics-effective_field_theorypenco-eftpdg-standard-modelEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
SMEFT extends the Standard Model Lagrangian by higher-dimension operators built from Standard Model fields and symmetries. It is an EFT of unspecified heavy new physics, not an effective reduction of the Standard Model itself.
Equip an existing carrier or structured object with additional chosen data, when such compatible data exists. Use a construction junction when several independently meaningful inputs must coexist on the same carrier or interact compatibly.
wp-physics-effective_field_theorypenco-eftwp-physics-standard_modelnlab-physics-standard_modelEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
SMEFT matches onto LEFT after electroweak symmetry breaking and integration of heavy Standard Model fields; LEFT Wilson coefficients retain the effects of SMEFT operators.
The target retains the degrees of freedom and interactions relevant below a stated scale or within a stated regime, while higher-energy or unresolved degrees of freedom from the source are integrated out, coarse-grained, or encoded in effective couplings.
jhep-leftpenco-eft