Does ''Higgs sector'' mean there are many Higgs particle types?

[ndung200790]

Please teach me this:
Does ''Higgs sector'' mean there are many Higgs particle types?Does custodial SU(2) symmetry using mean maybe there is a theory of electroweak interaction more complex than theory of single Higgs scalar?
Thank you in advance.

 

[ndung200790]

I mean there may be many type of Higgs boson in the theory of electroweak interaction because they say '' Higgs sector''.

 

[mfb]

There are models with multiple Higgs bosons (most notably supersymmetry), but I heard the term "Higgs sector" for the model with just one Higgs particle, too. The model of EW symmetry breaking is complex enough to call that part "Higgs sector".

 

[ndung200790]

Please tell me more some details of the role of custodial symmetry(SU(2)) in Standard Model extent.

 

[mfb]

If you look for an introduction to the Higgs mechanism, read a book or lecture script.