Generalized Lepton Number and Dark Left-Right Gauge Model

TL;DR

This paper proposes a modified left-right gauge model where a new right-handed neutrino becomes a dark matter candidate, explaining recent cosmic ray observations, by redefining lepton number and symmetry properties.

Contribution

It introduces a novel nonsupersymmetric left-right model with a generalized lepton number, allowing the right-handed neutrino to serve as dark matter.

Findings

n_R is a viable dark matter candidate.

The model explains PAMELA and ATIC cosmic ray data.

Predicts fermionic leptoquarks.

Abstract

In a left-right gauge model of particle interactions, the left-handed fermion doublet (nu,e)_L is connected to its right-handed counterpart (n,e)_R through a scalar bidoublet so that e_L pairs with e_R, and nu_L with n_R to form mass terms. Suppose the latter link is severed without affecting the former, then n_R is not the mass partner of nu_L, and as we show in this paper, becomes a candidate for dark matter which is relevant for the recent PAMELA and ATIC observations. We accomplish this in a specific nonsupersymmetric model, where a generalized lepton number can be defined, so that n_R and W_R are odd under R = (-1)^{3B+L+2j}. Fermionic leptoquarks are also predicted.