Consideration of a loop decay of dark matter particle into electron-positron from point of view of possible FSR suppression

TL;DR

This paper investigates the potential suppression of final state radiation in dark matter decay processes involving electron-positron pairs, aiming to address gamma-ray background constraints in cosmic positron anomalies.

Contribution

It explores a novel mechanism for FSR suppression via a specific Lagrangian involving new spinors and scalars in dark matter decay.

Findings

FSR suppression exists but is very low in the considered model.

The model offers a potential way to reduce gamma-ray overproduction.

The effect is dependent on the specifics of the Lagrangian structure.

Abstract

Cosmic positron anomaly is still not explained. Explanation with dark matter (DM) decay or annihilation is one of the main attempts to do it. But they suffer with shortcoming as overproduction of induced gamma-radiation which contradict to cosmic gamma-background. Final state radiation (FSR) in such processes is supposed under standard conditions (by default) to have the basic contribution in it. Our group elaborates possibility to evade this problem in different ways. Here we continue one of them connected with possibility of suppression of FSR due to specifics of Lagrangian describing DM particle decay. Loop through two new spinors and scalar is considered. Effect of FSR suppression is found to be existing but at the very low level in the considered case.