Searching for Sub-GeV Dark Matter in the Galactic Centre using Hyper-Kamiokande

Understand

Indirect detection of dark matter via its annihilation products is a key technique in the search for dark matter in the form of weakly interacting massive particles (WIMPs).

• Strong constraints exist on the annihilation of WIMPs to highly visible Standard Model final states such as photons or charged particles.
• In the case of s-wave annihilation, this typically eliminates thermal relic cross sections for dark matter of mass below $\cal{O}$(10) GeV.
• However, such limits typically neglect the possibility that dark matter may annihilate to assumed invisible or hard-to-detect final states, such as neutrinos.