Higgs quartic coupling and neutrino sector evolution in 2UED models

TL;DR

This paper investigates how two-Universal Extra Dimensions models affect the evolution of the Higgs quartic coupling and neutrino sector, using renormalisation group equations, and derives constraints from Higgs stability based on LHC data.

Contribution

It analyzes the renormalisation group evolution in 2UED models for different fermion localization scenarios, providing new constraints on the models' cutoff scale from Higgs potential stability.

Findings

Stronger bounds on the cutoff scale from Higgs stability constraints.

Different fermion localization scenarios impact the evolution of couplings.

LHC Higgs data constrains the validity range of 2UED models.

Abstract

Two compact universal extra dimensional models are an interesting class of models for different theoretical and phenomenological issues, such as the justification of having three standard model fermion families, suppression of proton decay rate, dark matter parity from relics of the 6-dimensional Lorentz symmetry, origin of masses and mixings in the standard model. However, these theories are merely effective ones, with typically a reduced range of validity in their energy scale. We explore two limiting cases of the three standard model generations all propagating in the bulk or all localised to a brane, from the point of view of renormalisation group equation evolutions for the Higgs sector and for the neutrino sector of these models. The recent experimental results of the Higgs boson from the LHC allow, in some scenarios, stronger constraints on the cut-off scale to be placed, from the requirement of the stability of the Higgs potential.