A "Littlest Higgs" with Custodial SU(2) Symmetry

A ``littlest higgs'' model is presented which has an approximate custodial SU(2) symmetry. The model is based on the coset space SO(9)/(SO(5)x SO(4)). The light pseudo-goldstone bosons of the theory include a single higgs doublet below a TeV and a set of three SU(2)_W triplets and an electroweak singlet in the TeV range. All of these scalars obtain approximately custodial SU(2) preserving vacuum expectation values. Performing a fit to the oblique parameters S and T, it is shown that a wide range of higgs masses is allowed in a large region of parameter space consistent with naturalness.
hep group
Last modified: Wed Sep 17 21:35:31 EDT 2003