Low-mass right-handed gauge bosons from minimal grand unified theories

TL;DR

This paper demonstrates that minimal grand unified theories like $SO(10)$ and $E_6$, with gravity-induced corrections, can predict low-mass right-handed gauge bosons accessible at colliders, while also fitting fermion masses and predicting long proton lifetimes.

Contribution

It shows that including dimension-5 gravity corrections in minimal GUTs allows for TeV-scale right-handed gauge bosons consistent with experimental constraints.

Findings

Predicts $W_R$ and $Z_R$ masses in the 3-10 TeV range.

Heavy pseudo-Dirac RH neutrinos are consistent with the model.

Proton lifetime exceeds current experimental limits.

Abstract

Prediction of low-mass $W_R$ and $Z_R$ gauge bosons in popular grand unified theories has been the subject of considerable attention over the last three decades. In this work we show that when gravity induced corrections due to dim.5 operator are included the minimal symmetry breaking chain of $SO(10)$ and $E_6$ GUTs can yield $W_R^{\pm}$ and $Z_R$ bosons with masses in the range $(3-10)$ TeV which are accessible to experimental tests at the Large Hordan Collider. The RH neutrinos turn out to be heavy pseudo-Dirac fermions. The model can fit all fermion masses and manifest in rich structure of lepton flavor violation while proton life time is predicted to be much longer than the accessible limit of Super-Kamiokande or planned Hyper-Kamiokande collaborations.