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## Test for lecture 2

- Explain the differences between global and local, exact and spontaneously broken symmetries.
- Why is a Higgs boson required to give mass to the W and Z bosons? Why is it required for fermions in the SM?
- In the SM, the Higgs field is a doublet. Couldn't it be a triplet? Explain.
- Why are there no flavour changing neutral currents (FCNC) at tree-level in the SM?
- What is the golden argument that there is new physics at a scale of 1 !TeV?
- True or false: the hierachy problem makes the SM mathematically inconsistent. Explain.
- What are the direct, indirect and theoretical constraints on the Higgs mass we know?

-- Main.ClaudeDuhr - 03 Sep 2008