● So far, precision measurements are consistent with a standard model electroweak sector described, at least effectively, by a scalar Higgs field < 200 GeV [LEP electroweak WG] ● Higgs field gives an economical, if not particularly insightful, description of fermion massesQuestion 2: Is electroweak symmetry broken by fermion condensation? ● So far (neglecting gravity) all observed particles follow the pattern of spin-1/2 fermions interacting by exchange of spin-1 gauge fields ● SU(2)xU(1) is broken in the standard model without a Higgs field, by the strong interaction ( But m W is O(1 GeV), not O(100 GeV) ) Question 1+2: Is there a composite Higgs boson? the above motivations, and ● Composite particles, like pions, kaons, eta, can be naturally light compared to the scale of other new physics ● If not the most “exciting ” scenario, at least not preposterous. Not ruled out, and an obvious benchmark at the LHC (versus SUSY, extra dimensions,...) Can start at the top, and work down
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