Abstract
We present a new multi-component dark matter model with a novel experimental signature that mimics neutral current interactions at neutrino detectors. In our model, the dark matter is composed of two particles, a heavier dominant component that annihilates to produce a boosted lighter component that we refer to as boosted dark matter. The lighter component is relativistic and scatters off electrons in neutrino experiments to produce Cherenkov light. This model combines the indirect detection of the dominant component with the direct detection of the boosted dark matter. Directionality can be used to distinguish the dark matter signal from the atmospheric neutrino background. We discuss the viable region of parameter space in current and future experiments.
Highlights
Background ratesThe atmospheric neutrino backgrounds have been measured by Super-K over a 10.7 year period, during runs SK-I (1489 days), SK-II (798 days), SK-III (518 days) and SK-IV (1096 days), and the final results are summarized in ref. [73]
This complementarity is lost when the interaction is due to a light mediator [107,108,109], which applies to our case where ψB interacts with SM states via an O(10 MeV) dark photon
We presented a novel dark matter (DM) scenario which incorporates the successful paradigm of WIMP thermal freeze-out, yet evades stringent constraints from direct and indirect detection experiments, and predicts a novel signal involving boosted DM
Summary
Consider two species of fermion DM ψA and ψB with Dirac masses mA > mB, which interact via a contact operator. To achieve a sufficiently large flux of boosted ψB particles, we need a large number density of ψA particles in the galactic halo For this reason, we will focus on somewhat low mass thermal DM, with typical scales: mA O(10 GeV), mB O(100 MeV), mγ O(10 MeV). We will focus on somewhat low mass thermal DM, with typical scales: mA O(10 GeV), mB O(100 MeV), mγ O(10 MeV) [52,53,54], both components in an inelastic DM multiplet can be cosmologically stable, such that the current day annihilation is not suppressed These splittings, would typically soften the bounds on the non-relativistic component of ψA/ψB from conventional direct detection experiments, since the scattering would be inelastic (either endothermic or exothermic).
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