Multi-messenger hunts for heavy WIMPs
  Heavy neutrinos have a long history of consideration in the literature, in
particular related to their role as solutions to the problems of neutrino mass,
baryon asymmetry, and possibly dark matter. Interestingly, recent developments
in the Madala hypothesis, a standard model extension designed to explain
persistent LHC lepton anomalies, may also necessitate a heavy neutrino. This
prospect is exciting as a dark matter model consisting of a TeV-scale
leptophilic fermionic particle is also invoked to explain the electron-positron
excess observed by the DAMPE experiment. The tantalising similarities between
these new fermions may allow indirect dark matter detection methods to probe
empirically compelling standard model extensions, like the Madala hypothesis.
However, the leptophilic nature and large mass mean the expected gamma-ray
signatures of annihilation or decay are weaker than those in the traditionally
considered heavy quark and tau lepton channels. In this work we explore whether
the KM3NeT neutrino detector could take advantage of the leptophilic nature of
the added particle to provide an alternative means of exploring such
interesting connections between cosmology and collider physics. We demonstrate
that dwarf galaxies, in particular highly dense ultra-faint dwarf galaxies like
Triangulum II, provide very strong prospects for KM3NeT searches.
