Decaying neutralino dark matter in anomalous $U(1)_H$ models

TL;DR

This paper explores how anomalous $U(1)_H$ models with R-parity violation can produce unstable or stable neutralino dark matter, with some models explaining cosmic-ray electron/positron anomalies.

Contribution

It identifies a class of purely trilinear R-parity violating models where neutralino dark matter remains stable cosmologically, contrasting with bilinear R-parity breaking scenarios.

Findings

Bilinear R-parity breaking neutralino decays are forbidden by astrophysical constraints.

Some models can explain cosmic-ray electron/positron flux anomalies.

Certain models predict neutralino stability on cosmological timescales.

Abstract

In supersymmetric models extended with an anomalous $U(1)_H$ different R-parity violating couplings can yield an unstable neutralino. We show that in this context astrophysical and cosmological constraints on neutralino decaying dark matter forbid bilinear R-parity breaking neutralino decays and lead to a class of purely trilinear R-parity violating scenarios in which the neutralino is stable on cosmological scales. We have found that among the resulting models some of them become suitable to explain the observed anomalies in cosmic-ray electron/positron fluxes.