TeV Symmetry and the Little Hierarchy Problem

Details TeV Symmetry and the Little Hierarchy Problem TeV Symmetry and the Little Hierarchy Problem

2003-08-19

arxiv.org/abs/hep-ph/0308199v2

JHEP 0309:051,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 1 figure; v.2: typos corrected and various minor modifications/expansions on the presentations. now 16 pages and 1 f

Scientific paper

10.1088/1126-6708/2003/09/051

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.

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