$Z_3$ Scalar Dark Matter with Strong Positron Fluxes

TL;DR

This paper introduces a $Z_3$ symmetric model with a complex scalar and vector-like lepton that explains dark matter abundance and significantly boosts positron fluxes, offering new phenomenological insights.

Contribution

It proposes a novel $Z_3$ symmetric extension with a scalar and lepton mediator that naturally enhances positron fluxes while satisfying experimental constraints.

Findings

Achieves correct dark matter relic abundance up to several TeV.

Enhances positron fluxes by several orders of magnitude with box-shaped spectra.

Evades constraints from collider and dark matter searches.

Abstract

We explore a class of simplified extensions to the Standard Model containing a complex singlet scalar as a dark matter candidate accompanied by a vector-like lepton as a mediator, both charged under a new $Z_3$ symmetry. In its simplest form, the new physics couples only to right-handed electrons, and the model is able to accommodate the correct dark matter relic abundance around the electroweak scale up to several TeV evading the strongest constraints from perturbativity, collider and dark matter searches. Furthermore, the model is capable to enhance naturally positron fluxes by several orders of magnitude presenting a box-shape spectra. This framework opens up a lot of phenomenological possibilities depending on the quantum charge assignments of the new fields.