TeV Scale B-L model with a flat Higgs potential at the Planck scale -- in view of the hierarchy problem

TL;DR

This paper explores a B-L extended Standard Model with a flat Higgs potential at the Planck scale, linking electroweak and Planck scale physics, and addressing the hierarchy problem through radiative symmetry breaking mechanisms.

Contribution

It presents a novel RG analysis of a B-L model with classical conformality, showing how the Higgs potential can be flat at the Planck scale and how electroweak symmetry breaking is dynamically generated.

Findings

B-L symmetry is radiatively broken at TeV scale via Coleman-Weinberg mechanism.

Higgs mass is near the stability bound, slightly lower than in the Standard Model.

Electroweak scale is dynamically related to the B-L breaking scale.

Abstract

The recent discovery of the Higgs-like particle at around 126 GeV has given us a big hint towards the origin of the Higgs potential. Especially the running quartic coupling vanishes near the Planck scale, which indicates a possible link between the physics in the electroweak and the Planck scales. Motivated by this and the hierarchy problem, we investigate a possibility that the Higgs has a flat potential at the Planck scale. In particular, we study the RG analysis of the B-L extension of the standard model with a classical conformality. The B-L symmetry is radiatively broken at the TeV scale via the Coleman-Weinberg mechanism. The electroweak symmetry breaking is triggered by a radiatively generated scalar mixing so that its scale 246 GeV is dynamically related with the B-L breaking scale at TeV. The Higgs boson mass is given at the border of the stability bound,which is lowered by a few GeV from the SM by the effect of the B-L gauge interaction.