TL;DR
This paper introduces a low-scale left-right-right-left symmetry model that naturally suppresses Higgs quadratic divergences, explains small neutrino masses, and sets the strong CP phase to zero, all at TeV energy scales.
Contribution
The paper presents a novel effective symmetry model with TeV-scale mirror sectors and a natural suppression of Higgs divergences, addressing multiple Standard Model issues.
Findings
Mirror fermions and gauge sectors at TeV scale
Quadratic divergence in Higgs loop suppressed to three loops
Zero strong CP phase in the model
Abstract
We propose an effective left-right-right-left model with a parity breaking scale around a few TeV. One of the main achievements of the model is that the mirror fermions as well as the mirror gauge sector simultaneously could be at TeV scale. It is shown that the most dangerous quadratic divergence of the SM Higgs boson involving the top quark in the loop is naturally suppressed, and begins at three loop. The model postpones the fine-tuning of the mass of the SM Higgs boson up to a sufficiently high scale. The model explains the smallness of the neutrino masses whether they are Dirac or Majorana. Furthermore, the strong phase is zero in this model.
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