INDIRECT DETECTION OF A LIGHT HIGGSINO MOTIVATED BY COLLIDER DATA

Kane and Wells recently argued that collider data point to a Higgsino- like lightest supersymmetric partner which would explain the dark matt er in our Galactic halo. They discuss direct detection of such dark-ma tter particles in laboratory detectors. Here, we argue that such a par ticle, if it is indeed the dark matter, might alternatively be accessi ble in experiments which search for energetic neutrinos from dark-matt er annihilation in the Sun. We provide accurate analytic estimates for the rates which take into account all relevant physical effects. Curr ently, the predicted signal falls roughly one to three orders of magni tude below experimental bounds, depending on the mass and coupling of the particle; however, detectors such as MACRO, super-Kamiokande, and AMANDA will continue to take data and should be able to rule out or co nfirm an interesting portion of the possible mass range for such a dar k-matter particle within the next five years.