ABSTRACT
This chapter focuses on the experimental signatures and how they differ from one another and from theories with fundamental Higgs bosons. It argues that whatever the answer to the origin of spontaneous symmetry breaking, a full knowledge of the experimental spectrum of spin-zero bosons will tell us what kinds of approaches are fruitful to consider. An alternative view puts the origin of the symmetry breaking in a different sector of the theory, one with new fundamental fermions that have gauge theory interactions. In analogy to the Glashow-Weinberg theorem for elementary Higgs models, one can avoid technipionmediated tree-level flavor-changing neutral currents by requiring that each fermion of a given electric charge gets its mass from at most one condensate of technifermions. A more general approach to constructing composite Higgs bosons has been taken by Kaplan, Georgi and collaborators.
