# 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