University of Wisconsin-Madison

Research Highlights: Dark Matter

We have produced the world-best limits on the spin-dependent cross section for weakly interacting dark matter particles. They are derived from the failure to observe the annihilation into neutrinos of dark matter particles gravitationally trapped by the Sun. IceCube can also perform indirect searches for dark matter by looking for the neutrino signature of dark matter annihilation in the galactic halo, galaxy clusters, and the left of the Earth.

Shows 90% confidence level upper limits on the spin-dependent cross section for hard and soft annihilation channels over a range of WIMP masses using IceCube data from May 2011 to May 2014. Results are shown in comparison to recent results by several other direct and indirect dark matter search experiments. Accelerator and cosmological search constraints have been applied to the allowed model parameter space.
Shows 90% confidence level upper limits on the spin-dependent cross section for hard and soft annihilation channels over a range of WIMP masses using IceCube data from May 2011 to May 2014. Results are shown in comparison to recent results by several other direct and indirect dark matter search experiments. Accelerator and cosmological search constraints have been applied to the allowed model parameter space.

The neutralino, the lightest weakly interacting massive particle (WIMP) in many supersymmetric models, is the usual test candidate in dark matter searches. The Sun provides the golden channel for searches of the annihilation of WIMPs since the expected signature is not subject to any astrophysical ambiguities. As seen in the graphic, IceCube has set limits on a combination of mass and cross section, i.e., for a given mass we exclude a cross section higher than a certain value. These are the most stringent upper limits yet for spin-dependent interactions of dark matter particles with ordinary matter.

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Take a closer look at the highest energy neutrinos.