A 130 GeV Gamma Ray Signal from Supersymmetry

TL;DR

This paper explores whether neutralino dark matter, specifically a mostly bino particle around 145 GeV, can explain the 130 GeV gamma ray signal from the Galactic Center, proposing a scenario consistent with observations and avoiding overproduction issues.

Contribution

It introduces a neutralino dark matter model with specific properties that can account for the gamma ray signal without conflicting with existing constraints.

Findings

The gamma ray signal can be explained by internal bremsstrahlung from a 145 GeV bino-like neutralino.

A small wino component enhances gamma+Z annihilation, fitting the observed signal.

Degenerate sleptons are necessary to boost the internal bremsstrahlung feature.

Abstract

The viability of neutralino dark matter as an explanation of the 130 GeV gamma ray signal from the Galactic Center recently observed by the Fermi Large Area Telescope is examined. It is found that the signal can be compatible with a sharp feature from internal bremsstrahlung from a mostly bino dark matter particle of mass around 145 GeV, augmented by a contribution from annihilation into gamma+Z via a small wino admixture. This scenario circumvents the problematic overproduction of lower energy continuum photons that plague line interpretations of this signal. Sleptons approximately degenerate in mass with the neutralino are required to enhance the internal bremsstrahlung feature.