Future MeV telescopes are projected to improve existing limits on sterile neutrino dark matter decay rates by several orders of magnitude.
Experimental bounds on sterile neutrino mixing angles
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abstract
We derive bounds on the mixing between the left-chiral ("active") and the right-chiral ("sterile") neutrinos, provided from the combination of neutrino oscillation data and direct experimental searches for sterile neutrinos. We demonstrate that the mixing of sterile neutrinos with any flavour can be significantly suppressed, provided that the angle theta_13 is non-zero. This means that the lower bounds on sterile neutrino lifetime, coming from the negative results of direct experimental searches can be relaxed (by as much as the order of magnitude at some masses). We also demonstrate that the results of the negative searches of sterile neutrinos with PS191 and CHARM experiments are not applicable directly to the see-saw models. The reinterpretation of these results provides up to the order of magnitude stronger bounds on sterile neutrino lifetime than previously discussed in the literature. We discuss the implications of our results for the Neutrino Minimal Standard Model (the NuMSM).
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Updated type-I seesaw analysis shows semileptonic tau decays like tau to lepton rho can dominate cLFV signals and some branching ratios may reach next-generation experiment sensitivity.
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Hunting Sterile Neutrino Dark Matter in the MeV Gap
Future MeV telescopes are projected to improve existing limits on sterile neutrino dark matter decay rates by several orders of magnitude.
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Revisiting lepton flavor violation: $\tau$ and meson decays
Updated type-I seesaw analysis shows semileptonic tau decays like tau to lepton rho can dominate cLFV signals and some branching ratios may reach next-generation experiment sensitivity.