Higgsless Theory of Electroweak Symmetry Breaking from Warped Space
Abstract
We study a theory of electroweak symmetry breaking without a Higgs boson. The theory is formulated in 5D warped space with the gauge bosons and matter fields propagating in the bulk. In the 4D dual picture, the theory appears as the standard model without a Higgs field, but with an extra gauge group G which becomes strong at the TeV scale. The strong dynamics of G breaks the electroweak symmetry, giving the masses for the W and Z bosons and the quarks and leptons. We find that, although the theory reproduces the tree-level standard-model structure at the leading order, it receives large radiative corrections enhanced by a logarithm of the large mass ratio between the Planck and weak scales. We discuss ways of canceling these corrections and present a potentially realistic theory. We also discuss implications of the theory, including the violation of universality in the W and Z boson couplings to matter and the spectrum of the Kaluza-Klein excitations of the gauge bosons. The theory reproduces many successful features of the standard model, although cancellations at a level of (10-30)% will be needed to satisfy constraints from the precision electroweak data.Keywords
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