Grand unification in the minimal left-right symmetric extension of the standard model

TL;DR

This paper investigates a minimal left-right symmetric extension of the standard model, exploring grand unification implications, neutrino phenomenology, and predicting very high parity breaking and heavy boson scales beyond current experimental reach.

Contribution

It analyzes the high-energy behavior of a minimal left-right symmetric model under grand unification assumptions, providing predictions for parity breaking and boson masses.

Findings

Parity breaking scale > 10^7 TeV

Heavy boson masses > 10^7 TeV

Right-handed neutrino mass ~100 TeV

Abstract

The simplest minimal left-right symmetric extension of the standard model is studied in the high energy limit, and some consequences of the grand unification hypothesis are explored assuming that the parity breaking scale is the only relevant energy between the electro-weak scale and the unification point. While the model is shown to be compatible with the observed neutrino phenomenology, the parity breaking scale and the heavy boson masses are predicted to be above 10^7 TeV, quite far from the reach of nowadays experiments. Below that scale only an almost sterile right handed neutrino is allowed with a mass M \approx 100 TeV.