Proposition of FSR Photon Suppression Employing a Two-Positron Decay Dark Matter Model to Explain Positron Anomaly in Cosmic Rays

TL;DR

This paper proposes a dark matter model involving a doubly charged particle decay to explain the cosmic positron excess, focusing on suppressing gamma-ray signals from final state radiation to align with observational data.

Contribution

It introduces a novel dark matter decay model with a doubly charged particle to reduce gamma-ray emissions while explaining positron excesses in cosmic rays.

Findings

Model successfully suppresses FSR gamma radiation.

Consistent with observed positron excess.

Provides a new approach to dark matter indirect detection.

Abstract

The origin of an anomalous excess of high-energy (about 100 GeV and higher) positrons in cosmic rays is one of the rare problems in this field, which is proposed to be solved with dark matter (DM). Attempts to solve this problem are faced with the issue of having to satisfy the data on cosmic positrons and cosmic gamma radiation, which inevitably accompanies positron production, such as FSR (final state radiation), simultaneously. We have been trying to come up with a solution by means of two approaches: making assumptions (*) about the spatial distribution of the dark matter and (**) about the physics of its interactions. This work is some small final step of a big investigation regarding the search for gamma suppression by employing the second approach, and a model with a doubly charged particle decaying into two positrons (X++ $\rightarrow$ e+ e+) is suggested as the most prospective one from those considered before.