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Natural electroweak breaking from a mirror symmetry.
Z Chacko1, Hock-Seng Goh, Roni Harnik
1Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.
Physical Review Letters
|June 29, 2006
Summary
Twin Higgs models introduce the Higgs boson as a pseudo Goldstone boson, protecting the weak scale from radiative corrections up to 10 TeV. These models naturally achieve electroweak symmetry breaking without new light standard model particles.
Area of Science:
- Particle Physics
- High Energy Physics
- Cosmology
Background:
- The Standard Model (SM) of particle physics has a hierarchy problem, where the Higgs boson mass is sensitive to high-energy physics.
- Radiative corrections typically destabilize the electroweak scale, requiring fine-tuning or new physics at the TeV scale.
Purpose of the Study:
- To present Twin Higgs models as a solution to the hierarchy problem.
- To demonstrate natural electroweak symmetry breaking without new light SM particles.
Main Methods:
- Introducing a discrete symmetry in the ultraviolet (UV) that relates SM particles to a 'twin' sector.
- Utilizing an approximate global symmetry in the Higgs sector, broken to generate the Higgs potential.
- Constraining corrections to the Higgs potential via discrete and global symmetries.
Main Results:
- Twin Higgs models protect the weak scale from radiative corrections up to 5-10 TeV.
- Precision electroweak constraints are satisfied by construction.
- These models offer a natural explanation for electroweak symmetry breaking.
Conclusions:
- Stabilizing the weak scale does not necessitate new light particles charged under SM gauge groups.
- Twin Higgs models provide a viable alternative to conventional solutions for the hierarchy problem.