TeV Symmetry and the Little Hierarchy Problem

Abstract

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.

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

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• Particle Dark Matter from Physics Beyond the Standard Model
• Pair production of the T-odd leptons at the LHC
• Using the Higgs boson to probe the littlest Higgs model with T-parity through $Z_H{W}_H$ production at the LHC
• One-loop QCD correction to top pair production in the littlest Higgs model with T-parity at the LHC
• Identification of new physics and general WIMP search at the ILC
• The littlest Higgs model with T-parity and single top production at $ep$ collision
• Flavour Physics in the Littlest Higgs Model with T-Parity: Effects in the K, B_d/s and D systems
• Ultra High Energy Cosmic Rays from decays of Holeums in Galactic Halos
• Topological physics in the standard model and beyond
• NLO QCD corrections to same-sign $T$-odd quark pair production in the littlest Higgs model with $T$-parity at the LHC
• One Loop Renormalization of the Littlest Higgs Model
• Phenomenology of the Hidden SU(2) Vector Dark Matter Model
• Twist-2 operators induced Dark Matter Interactions
• CP Violation in Dual Dark Matter
• Phenomenological implications of the new Littlest Higgs model with T-parity
• Precise calculation for heavy gauge boson production in the LHT model
• Rare Higgs three body decay induced by top-Higgs FCNC coupling in the littlest Higgs Model with T-parity
• Operators in ultraviolet completions for Electroweak collective symmetry breaking
• Measuring the Shape of the Extra Dimension
• QCD radiative correction to pair-annihilation of spin-1 bosonic Dark Matter
• Little Higgs model effects in $\gamma \gamma \to \gamma \gamma$
• A new and gauge-invariant Littlest Higgs model with T-parity
• $T$-odd quark pair production and decay at $\gamma \gamma$ collider in the littlest Higgs model with $T$ parity in next-to-leading order QCD
• Determination of Dark Matter Properties at High-Energy Colliders
• Aspects of astrophysical particle production and beyond the Standard Model phenomenology
• Production and decay of for the 125 GeV Higgs boson in the littlest Higgs model with T-parity
• Associated production of a photon with dark matter pair at the ILC within the Littlest Higgs model with T-parity