Explaining the CMS excesses, baryogenesis and neutrino masses in $E_{6}$ motivated $U(1)_{N}$ model

TL;DR

This paper explores an $E_6$ inspired $U(1)_N$ extension of the supersymmetric standard model, explaining CMS excesses, baryogenesis, and neutrino masses, with multiple variants offering different mechanisms and symmetries.

Contribution

It introduces new variants of the $E_6$ motivated $U(1)_N$ model that explain experimental anomalies, baryogenesis, and neutrino masses, proposing novel discrete symmetries and decay mechanisms.

Findings

All variants explain CMS excesses via exotic slepton decay.

Four variants support high-scale baryogenesis or leptogenesis.

A new discrete symmetry ensures proton stability and suppresses flavor-changing processes.

Abstract

We study the superstring inspired $E_{6}$ model motivated $U(1)_{N}$ extension of the supersymmetric standard model to explore the possibility of explaining the recent excess CMS events and the baryon asymmetry of the universe in eight possible variants of the model. In light of the hints from short-baseline neutrino experiments at the existence of one or more light sterile neutrinos, we also study the neutrino mass matrices dictated by the field assignments and the discrete symmetries in these variants. We find that all the variants can explain the excess CMS events via the exotic slepton decay, while for a standard choice of the discrete symmetry four of the variants have the feature of allowing high scale baryogenesis (leptogenesis). For one other variant three body decay induced soft baryogenesis mechanism is possible which can induce baryon number violating neutron-antineutron oscillation. We also point out a new discrete symmetry which has the feature of ensuring proton stability and forbidding tree level flavor changing neutral current processes while allowing for the possibility of high scale leptogenesis for two of the variants. On the other hand, neutrino mass matrix of the $U(1)_{N}$ model variants naturally accommodates three active and two sterile neutrinos which acquire masses through their mixing with extra neutral fermions giving rise to interesting textures for neutrino masses.