Extended Color Twin Higgs
Brian Batell, Thomas Cochran, Logan Page, Christopher B. Verhaaren

TL;DR
This paper introduces an extended color gauge symmetry in the Twin Higgs model, leading to new collider signatures and cosmological features, while maintaining naturalness with less tuning.
Contribution
It proposes a novel variation of the mirror Twin Higgs model with extended SU(4)_c color gauge symmetry, breaking the mirror Z2 symmetry and exploring its phenomenological and cosmological implications.
Findings
Predicts heavy vectors and fermions with fractional electric charges.
Reduces ΔN_eff and predicts stable spin-0 baryons in the twin sector.
Maintains naturalness with less tuning than original models.
Abstract
We describe a novel variation of the mirror Twin Higgs model in which the color gauge group in both sectors is extended to SU(4 and spontaneously broken to SU(3 exclusively in the visible sector. Through this process, the mirror symmetry is spontaneously broken, allowing for a phenomenologically viable electroweak vacuum alignment. This structure produces interesting collider signatures, including heavy vectors and fermions with fractional electric charges. The twin sector, with unbroken SU(4, produces interesting cosmological characteristics, such as the possibility to reduce and stable spin-0 baryons. The enlarged top quark sector required by the extended color gauge symmetry preserves naturalness, with even less tuning than the original twin Higgs in many circumstances.
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