Physics - High Energy Astrophysical Phenomena Physics - High Energy Physics - Phenomenology
Dark Matter particles in the Galactic Center and halo can annihilate or decay
into a pair of neutrinos producing a monochromatic flux of neutrinos. The
spectral feature of this signal is unique and it is not expected from any
astrophysical production mechanism. Its observation would constitute a dark
matter smoking gun signal. We performed the first dedicated search with a
neutrino telescope for such signal, by looking at both the angular and energy
information of the neutrino events. To this end, a total of five years of
IceCube's DeepCore data has been used to test dark matter masses ranging from
10~GeV to 40~TeV. No significant neutrino excess was found and upper limits on
the annihilation cross section, as well as lower limits on the dark matter
lifetime, were set. The limits reached are of the order of $10^{-24}$~cm$^3/s$
for an annihilation and up to $10^{27}$ seconds for decaying Dark Matter. Using
the same data sample we also derive limits for dark matter annihilation or
decay into a pair of Standard Model charged particles.