LHC: composite Higgs

The LHC Shows the Way workshop is about to end, and the slow live blog limps along with a presentation on the composite Higgs.

A model for having a light (~ 100 GeV ) scalar, is to have a composite Higgs instead of the alternative of either a true supersymmetric model or a light dilaton scalar.

As with such models in general, they violate unitarity if extrapolated to higher energies, so force a new energy scale, at, say, few TeV – like another particle there (cf old effective weak interaction theory).

Yes, if you work it out in detail, the effective coupling runsaway and you need to truncate the effective theory, so there has to be new stuff up there, if the LHC boson signal is a composite particle.