Dark Matter-Neutrino Interconversion at COHERENT, Direct Detection, and the Early Universe

Abstract

We study a Dark Matter (DM) model in which the dominant coupling to the standard model occurs through a neutrino-DM-scalar coupling. The new singlet scalar will generically have couplings to nuclei/electrons arising from renormalizable Higgs portal interactions. As a result the DM particle $X$ can convert into a neutrino via scattering on a target nucleus $\mathcal{N}$: $X+\mathcal{N}\to \nu +\mathcal{N}$, leading to striking signatures at direct detection experiments. Similarly, DM can be produced in neutrino scattering events at neutrino experiments: $\nu +\mathcal{N}\to X+\mathcal{N}$, predicting spectral distortions at experiments such as COHERENT. Furthermore, the model allows for late kinetic decoupling of dark matter with implications for small-scale structure. At low masses, we find that COHERENT and late kinetic decoupling produce the strongest constraints on the model, while at high masses the leading constraints come from DM down-scattering at XENON1T and Borexino. Future improvement will come from CE$\nu$NS data, ultra-low threshold direct detection, and rare kaon decays.

7 pages, 5 figures

References in corpus (7)

• Observation of Coherent Elastic Neutrino-Nucleus Scattering
• Is dark matter with long-range interactions a solution to all small-scale problems of ΛCDM cosmology?
• Scalar Simplified Models for Dark Matter
• Effects of cold dark matter decoupling and pair annihilation on cosmological perturbations
• Searches for invisible decays of the Higgs boson in pp collisions at sqrt(s) = 7, 8, and 13 TeV
• MeV Dark Matter and Small Scale Structure
• Constraining dark matter-neutrino interactions with IceCube-170922A

Cited by in corpus (1)

• Dark magnetic dipole property in fermionic absorption by nucleus and electrons