Classically Conformal B-L extended Standard Model

TL;DR

This paper explores a classically conformal B-L extended Standard Model where quantum corrections induce symmetry breaking, naturally generating neutrino masses and triggering electroweak symmetry breaking, with viable parameter space.

Contribution

It introduces a minimal conformal B-L model where gauge symmetry breaking and electroweak symmetry breaking are achieved via quantum effects without explicit mass terms.

Findings

Successful radiative B-L symmetry breaking via Coleman-Weinberg potential

Dynamical generation of Higgs mass parameter

Parameter space consistent with theoretical and experimental constraints

Abstract

Under a hypothesis of classically conformal theories, we investigate the minimal B-L extended Standard Model, which naturally provides the seesaw mechanism for explaining tiny neutrino masses. In this setup, the radiative gauge symmetry breaking is successfully realized in a very simple way: The B-L gauge symmetry is broken through the conformal anomaly induced by quantum corrections in the Coleman-Weinberg potential. Associated with this B-L symmetry breaking, the Higgs mass parameter is dynamically generated, by which the electroweak symmetry breaking is triggered. We find that a wide range of parameter space can satisfy both the theoretical and experimental requirements.