Neutrino Signals from Solar Neutralino Annihilations in Anomaly Mediated Supersymmetry Breaking Model

TL;DR

This study investigates the potential for detecting neutrino signals from neutralino annihilations in the Sun within the AMSB supersymmetry model, highlighting conditions for observable muon events at IceCube and their use in distinguishing SUSY scenarios.

Contribution

The paper provides a detailed simulation of neutrino and muon signals from neutralino annihilations in the AMSB model, linking neutralino composition to detectable signals at IceCube.

Findings

Detectable muon signals at IceCube are possible with large higgsino component neutralinos.

Annual muon event rates can reach up to 102 under favorable parameters.

Muon energy spectra can differentiate the AMSB model from other SUSY breaking models.

Abstract

The lightest neutralino, as the dark matter candidate, can be gravitationally captured by the Sun. In this paper, we studied the high energy neutrino signals from solar neutralino annihilations in the core of the Sun in the anomaly mediated supersymmetry (SUSY) breaking (AMSB) model. Based on the event-by-event monte carlo simulation code WimpSim, we studied the detailed energy and angular spectrum of the final muons at large neutrino telescope IceCube. More precisely we simulated the processes since the production of neutrino via neutralino annihilation in the core of the Sun, neutrino propagation from the Sun to the Earth, as well as the converting processes from neutrino to muon. Our results showed that in the AMSB model it is possible to observe the energetic muons at IceCube, provided that the lightest neutralio has relatively large higgsino component, as a rule of thumb $ N_{13}^2 + N_{14}^2 > 4%$ or equivalently $ \sigma_{SD} > 10^{- 5} pb$. Especially, for our favorable parameters the signal annual events can reach 102 and the statistical significance can reach more than 20. We pointed out that the energy spectrum of muons may be used to distinguish among the AMSB model and other SUSY breaking scenarios.