Extra Gauge Invariance from an Extra Dimension
Christopher D. Carone, Joshua Erlich, Marc Sher
TL;DR
This paper explores higher-dimensional theories that produce larger gauge symmetries in 4D, including a Higgsless electroweak model and a chiral color model, highlighting novel mechanisms for symmetry breaking and fermion mass generation.
Contribution
It introduces models with extra dimensions that realize enhanced gauge symmetries and novel symmetry-breaking mechanisms without a Higgs boson.
Findings
Constructed a Higgsless SU(2) x U(1) electroweak model with custodial symmetry.
Demonstrated fermion mass generation with universal gauge couplings.
Developed a chiral color model based on a single SU(3).
Abstract
We describe higher-dimensional theories whose low-energy 4D descriptions contain larger gauge or global symmetry groups. As an example, we construct a Higgsless SU(2) x U(1) model of electroweak symmetry breaking. The 5D SU(2) gauge invariance contains both the weak SU(2) gauge group and a custodial symmetry that protects the rho parameter. Fermions obtain isospin-violating masses while maintaining universal gauge couplings among all three generations. As a further example, we construct a model of chiral color based on a single SU(3).
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