High energy neutrinos from neutralino annihilations in the Sun

Abstract

Neutralino annihilations in the Sun to weak boson and top quark pairs lead to high-energy neutrinos that can be detected by the IceCube and KM3 experiments in the search for neutralino dark matter. We calculate the neutrino signals from real and virtual WW, ZZ, Zh, and $t\bar{t}$ production and decays, accounting for the spin-dependences of the matrix elements, which can have important influences on the neutrino energy spectra. We take into account neutrino propagation including neutrino oscillations, matter-resonance, absorption, and nu_tau regeneration effects in the Sun and evaluate the neutrino flux at the Earth. We concentrate on the compelling Focus Point (FP) region of the supergravity model that reproduces the observed dark matter relic density. For the FP region, the lightest neutralino has a large bino-higgsino mixture that leads to a high neutrino flux and the spin-dependent neutralino capture rate in the Sun is enhanced by 10^3 over the spin-independent rate. For the standard estimate of neutralino captures, the muon signal rates in IceCube are identifiable over the atmospheric neutrino background for neutralino masses above M_Z up to 400 GeV.

45 pages, 18 figures and 5 tables, PRD version

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• New Limits on Dark Matter from Super-Kamiokande
• Dark matter in the solar system II: WIMP annihilation rates in the Sun
• Indirect Dark Matter Detection Limits from the Ultra-Faint Milky Way Satellite Segue 1
• Phenomenology of Dark Matter annihilation into a long-lived intermediate state
• Spin Dependence of Dark Matter Scattering
• Dark Matter Indirect Signatures
• Collider signals and neutralino dark matter detection in relic-density-consistent models without universality
• Prospects for Detecting Neutrino Signals from Annihilating/Decaying Dark Matter to Account for the PAMELA and ATIC results
• Muon Fluxes From Dark Matter Annihilation
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• Probing Dark Matter Dynamics via Earthborn Neutrinos at IceCube
• $\chi$aro$\nu$: a tool for neutrino flux generation from WIMPs
• Fermion WIMPless Dark Matter at DeepCore and IceCube
• A novel method to extract dark matter parameters from neutrino telescope data
• Future sensitivity of neutrino telescopes to dark matter annihilations from the cosmic diffuse neutrino signal
• Dark Matter Prospects in Deflected Mirage Mediation
• Neutrino Signals from Solar Neutralino Annihilations in Anomaly Mediated Supersymmetry Breaking Model
• Complementarity of Gamma-ray and LHC Searches for Neutralino Dark Matter in the Focus Point Region
• Direct Detection Constraints on Dark Matter Event Rates in Neutrino Telescopes, and Collider Implications
• When Freeze-out occurs due to a non-Boltzmann suppression: A study of degenerate dark sector