What does it mean when they say the Gauge Sector of SM?

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SUMMARY

The Gauge Sector of a Standard Model (SM) refers specifically to the components of the Lagrangian that involve gauge field strength tensors, represented as F², which pertain to electro-weak and gluon fields. In addition to the Gauge Sector, the discussion identifies two other critical sectors: the fermionic sector, which includes the kinetic terms for fermions and their interactions with gauge fields, and the Higgs sector, encompassing the Higgs kinetic term, mass term, and its couplings to other fields. Understanding these sectors is essential for grasping the fundamental interactions described by the Standard Model.

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what does it mean when they say the Gauge "Sector" of SM?

what other sectors are there?

Thanks
 
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I guess they (who are they?) mean the gauge field sector, i.e. the terms in the Lagrangian where only the field strength tensors appear as F² (for the electro-weak gauge fields and the gluon fields).

The other sectors would be
a) the fermionic sectors (where we have the kinetic terms of the fermions plus the interaction with the gauge field)
b) the Higgs sector (where we have the Higgs kinetic term, the mass term, plus its couplings to all other fields)
 

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