Abstract
Dark matter (DM) scattering and its subsequent capture in the Sun can boost the local relic density, leading to an enhanced neutrino flux from DM annihilations that is in principle detectable at neutrino telescopes. We calculate the event rates expected for a radiative seesaw model containing both scalar triplet and singlet-doublet fermion DM candidates. In the case of scalar DM, the absence of a spin dependent scattering on nuclei results in a low capture rate in the Sun, which is reflected in an event rate of less than one per year in the current IceCube configuration with 86 strings. For singlet-doublet fermion DM, there is a spin dependent scattering process next to the spin independent one, which significantly boosts the event rate and thus makes indirect detection competitive with respect to the direct detection limits imposed by PICO-60. Due to a correlation between both scattering processes, the limits on the spin independent cross section set by XENON1T exclude also parts of the parameter space that can be probed at IceCube. Previously obtained limits by ANTARES, IceCube and Super-Kamiokande from the Sun and the Galactic Center are shown to be much weaker.
Highlights
Two of the biggest current challenges in theoretical particle physics concern the nature of dark matter (DM) as well as the generation of neutrino masses, both of which cannot be convincingly explained by the Standard Model (SM) [1,2]
We have studied in this paper the prospects to probe radiative seesaw models with neutrino signals from DM annihilation and detectors such as ANTARES, Super-Kamiokande and, in particular, IceCube, focusing on the model T1-3-B with α 1⁄4 0 with either scalar triplet or singlet-doublet fermion DM
The relevant Yukawa couplings involved are usually strongly constrained to be small from neutrino masses and lepton flavor violation (LFV) processes, which are always present in these models
Summary
Two of the biggest current challenges in theoretical particle physics concern the nature of dark matter (DM) as well as the generation of neutrino masses, both of which cannot be convincingly explained by the Standard Model (SM) [1,2]. We show results for the spin independent and spin dependent WIMP-nucleon cross sections, the thermally averaged cross section in the Galactic Center and the expected event rates from annihilations in the Sun in the current IceCube configuration with 86 strings (IC86). These results are compared to limits from the direct detection experiments XENON1T and PICO-60, and to previously obtained limits from neutrino observations in the Sun and the Galactic Center with ANTARES, IceCube, and Super-Kamiokande.
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