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Published November 15, 1991 | Published
Journal Article Open

Energetic neutrinos from heavy-neutralino annihilation in the Sun


Neutralinos may be captured in the Sun and annihilate therein producing high-energy neutrinos. Present limits on the flux of such neutrinos from underground detectors such as Irvine-Michigan-Brookhaven (IMB) and Kamiokande II may be used to rule out certain supersymmetric dark-matter candidates, while in many other supersymmetric models the rates are large enough that if neutralinos do reside in the galactic halo, observation of a neutrino signal may be possible in the near future. Neutralinos that are either nearly pure Higgsino or a Higgsino-gaugino combination are generally captured in the Sun by a scalar interaction with nuclei in which a virtual lightest Higgs boson is exchanged. If the squark mass is not much greater than the neutralino mass then capture of neutralinos that are primarily gaugino occurs predominantly by spin-dependent scattering off hydrogen in the Sun. Although only neutrinos from annihilation in the Sun are considered here, the neutrino signal from weakly interacting massive particle annihilation in the Earth should be of comparable strength. Detection rates for mixedstate neutralinos are generally higher than those for Higgsinos or gauginos.

Additional Information

© 1991 The American Physical Society Received 24 April 1991 It is a pleasure to thank David Seckel, Kim Griest, Michael Turner, Francis Halzen, Tim Seltzer, Andrew Gould, and Stuart Mufson for useful discussions. This research was supported in part by the DOE (at Chicago and at Fermilab), by NASA (Grant No. NGW--1340 at Fermilab), and by the NASA Graduate Student Researchers Program.

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