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Abstract
Dark matter particles gravitationally trapped inside the Sun may annihilate into Standard Model particles, producing a flux of neutrinos. The prospects of detecting these neutrinos in future multi-kt neutrino detectors designed for other physics searches are explored here. We study the capabilities of a 34/100 kt liquid argon detector and a 100 kt magnetized iron calorimeter detector. These detectors are expected to determine the energy and the direction of the incoming neutrino with unprecedented precision allowing for tests of the dark matter nature at very low dark matter masses, in the range of 10–25 GeV. By suppressing the atmospheric background with angular cuts, these techniques would be sensitive to dark matter-nucleon spin-dependent cross sections at the fb level, reaching down to a few ab for the most favorable annihilation channels and detector technology.
Highlights
A plethora of cosmological and astrophysical measurements over the last decades has tested the validity of the Standard Model of Big Bang cosmology at an unprecedented level of precision
Large underground neutrino detectors [33,34,35,36,37,38,39] have been very successful in observing neutrinos from several natural and artificial sources and have provided one of the few evidences we have of physics beyond the SM, as well fundamental results in astrophysics [40, 41]
In this paper we have studied the detection of neutrinos as a possible indirect signal of low mass (10–25 GeV) dark matter (DM) annihilating in the Sun at the generation of neutrino detectors, as well as the determination of which annihilation channels are present
Summary
A plethora of cosmological and astrophysical measurements over the last decades has tested the validity of the Standard Model of Big Bang cosmology (a spatially flat Friedman– Robertson–Walker model) at an unprecedented level of precision. In the case of neutrinos, the higher densities of DM expected to be gravitationally trapped in celestial bodies, such as the Sun [18, 19] or the Earth [20, 21] offer a very appealing alternative since, contrary to positrons or gamma-rays, neutrinos can escape the solar interior providing a snapshot of the interaction taking place These indirect searches, provide a very complementary tool to direct detection probes since, unlike them, they will provide a measurement of the DM mass and scattering cross section, and information on the different annihilation branching ratios, depending on the particular channel searched for.
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