1111.1063 (Yasaman Farzan)

Flavoring Monochromatic Neutrino Flux from Dark Matter Annihilation    [PDF]

Yasaman Farzan

As is well-known, if the scattering cross section of the Dark Matter (DM)
particles off the nuclei inside the Sun is large enough, the Sun can trap DM
particles. In principle, the annihilation of DM pair inside the Sun can then
lead to the detection of a relatively large flux of neutrinos in the neutrino
telescopes. If the annihilation directly produces a neutrino pair, the flux of
neutrinos on Earth will be monochromatic. In this case, the oscillatory terms
in the oscillation probability lead to a novel seasonal variation of detected
events which is sensitive to the initial flavor composition. In this paper, we
propose two models that predict such a detectable monochromatic neutrino flux
from the DM annihilation. Model I, which is based on augmenting the type II
seesaw mechanism, predicts a flavor composition for the monochromatic flux
determined by $(m_\nu)_{\alpha \beta}$. In model II, the DM pair first
annihilates to a pair of sterile neutrinos which oscillate into active
neutrinos with a flavor composition determined by the flavor structure of the
active-sterile neutrino mixing.

View original: http://arxiv.org/abs/1111.1063