Multiyear Search for Dark Matter Annihilations in the Sun with the AMANDA-II and IceCube Detectors
2012
A search for an excess of
muon neutrinosfrom dark matter annihilations in the Sun has been performed with the AMANDA-II neutrino telescope using data collected in 812 days of live time between 2001 and 2006 and 149 days of live time collected with the AMANDA-II and the 40-string configuration of IceCube during 2008 and early 2009. No excess over the expected atmospheric neutrino background has been observed. We combine these results with the previously published IceCube limits obtained with data taken during 2007 to obtain a total live time of 1065 days. We provide an upper limit at 90% confidence level on the annihilation rate of captured
neutralinosin the Sun, as well as the corresponding muon
flux limitat the Earth, both as functions of the
neutralinomass in the range 50-5000 GeV. We also derive a limit on the
neutralino-proton spin-dependent and spin-independent cross section. The limits presented here improve the previous results obtained by the collaboration between a factor of 2 and 5, as well as extending the
neutralinomasses probed down to 50 GeV. The spin-dependent cross section limits are the most stringent so far for
neutralinomasses above 200 GeV, and well below direct search results in the mass range from 50 GeV to 5 TeV.
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