TeV Symmetry and the Little Hierarchy Problem
Constraints from precision electroweak measurements reveal no
evidence for new physics up to 5 -- 7 TeV, whereas naturalness
requires new particles at around 1 TeV to address the stability of
the electroweak scale. We show that this ``little hierarchy
problem'' can be cured by introducing a symmetry for new particles
at the TeV scale. As an example, we construct a little Higgs model
with this new symmetry, dubbed T-parity, which naturally solves
the little hierarchy problem and, at the same time, stabilize the
electroweak scale up to 10 TeV. The model has many important
phenomenological consequences, including consistency with the
precision data without any fine-tuning, a stable
weakly-interacting particle as the dark matter candidate, as well
as collider signals completely different from existing little
Higgs models, but rather similar to the supersymmetric theories
with conserved R-parity.
hep group
Last modified: Wed Sep 17 21:35:31 EDT 2003