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Canonical static concept record
Low-energy effective field theory below the electroweak scale (LEFT)
The effective field theory below the electroweak scale after integrating out the W, Z, Higgs, and top quark. It contains QCD and QED for light fields plus higher-dimension weak and possible beyond-Standard-Model operators.
Record metadata
Canonical name
Low-energy effective field theory below the electroweak scale (LEFT)
This is an authored directed relation from the source endpoint to the target endpoint.
Relation ID
sm_to_left
Relation type
Effective theory / model effective-theory
Direction
source → target
Endpoint roles
source: Has effective description; target: Effective description of
Authored annotation
integrate out electroweak-scale fields
Authored explanation
Below the electroweak scale, integrating out W, Z, Higgs, and top degrees of freedom yields LEFT with QCD, QED, and local higher-dimension operators.
How to interpret this relation type
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.
This is an authored directed relation from the source endpoint to the target endpoint.
Relation ID
smeft_to_left
Relation type
Effective theory / model effective-theory
Direction
source → target
Endpoint roles
source: Has effective description; target: Effective description of
Authored annotation
match below electroweak scale
Authored explanation
SMEFT matches onto LEFT after electroweak symmetry breaking and integration of heavy Standard Model fields; LEFT Wilson coefficients retain the effects of SMEFT operators.
How to interpret this relation type
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.