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We consider the use of directionality in the search for monoenergetic sub-GeVneutrinos arising from the decay of stopped kaons, which can be produced bydark matter annihilation in the core of the Sun. When these neutrinos undergocharged-current interactions with a nucleus at a neutrino detector, they ofteneject a proton which is highly peaked in the forward direction. The directionof this track can be measured at DUNE, allowing one to distinguish signal frombackground by comparing on-source and off-source event rates. We find thatdirectional information can enhance the signal to background ratio by up to afactor of 5.

Directional Searches at DUNE for Sub-GeV Monoenergetic Neutrinos Arising from Dark Matter Annihilation in the Sun