Investigating electron interacting dark matter

TL;DR

This paper explores a dark matter model where particles interact primarily with electrons, discussing theoretical foundations, phenomenological implications, and constraints from DAMA/NaI data, with potential links to galactic gamma-ray observations.

Contribution

It introduces a specific dark matter interaction model with electrons, analyzing its phenomenology and deriving parameter constraints from experimental data.

Findings

Allowed parameter regions identified from DAMA/NaI data

Potential explanation for 511 keV galactic photon line

Theoretical framework for electron-interacting dark matter

Abstract

Some extensions of the Standard Model provide Dark Matter candidate particles which can have a dominant coupling with the lepton sector of the ordinary matter. Thus, such Dark Matter candidate particles ($\chi^{0}$) can be directly detected only through their interaction with electrons in the detectors of a suitable experiment, while they are lost by experiments based on the rejection of the electromagnetic component of the experimental counting rate. These candidates can also offer a possible source of the 511 keV photons observed from the galactic bulge. In this paper this scenario is investigated. Some theoretical arguments are developed and related phenomenological aspects are discussed. Allowed intervals and regions for the characteristic phenomenological parameters of the considered model and of the possible mediator of the interaction are also derived considering the DAMA/NaI data.