On prospects for dark matter indirect detection in the Constrained MSSM

TL;DR

This paper evaluates the likelihood of detecting gamma rays and positrons from neutralino dark matter annihilation in the Galactic halo within the Constrained MSSM, highlighting detection challenges and dependencies on halo profile assumptions.

Contribution

It provides the first comprehensive probability ranges for gamma-ray and positron fluxes from neutralino annihilation in the Constrained MSSM, considering halo profile uncertainties and priors.

Findings

Gamma-ray flux probability spans about one order of magnitude (68%) and up to four orders (95%).

Detectability by GLAST depends on halo cuspiness.

Positron flux likely undetectable by PAMELA unless halo profile is extremely cuspy.

Abstract

In the framework of the Constrained MSSM we derive the most probable ranges of the diffuse gamma radiation flux from the direction of the Galactic center and of the positron flux from the Galactic halo due to neutralino dark matter annihilation. We find that, for a given halo model, and assuming flat priors, the 68% probability range of the integrated gamma-ray flux spans about one order of magnitude, while the 95% probability range can be much larger and extend over four orders of magnitude (even exceeding five for a tiny region at small neutralino mass). The detectability of the signal by GLAST depending primarily on the cuspiness of the halo profile. The positron flux, on the other hand, appears to be too small to be detectable by PAMELA, unless the boost factor is at least of order ten and/or the halo profile is extremely cuspy. We also briefly discuss the sensitivity of our results to the choice of priors.