Speaker
Joao Paulo Pinheiro
(TDLI)
Description
The ultra-high-energy event KM3--230213A has been attributed
to dark matter (DM) decay, despite arriving opposite the
Galactic Centre. We construct a per-event test statistic to
quantify this hypothesis and forecast the events needed to exclude
it in favour of an isotropic signal. The single observed event
disfavours but does not exclude DM decay ($p_{\rm DM}\simeq0.13$--$0.15$).
Including time-averaged detector visibility lowers the required sample
from ${\sim}33$--$43$ to ${\sim}22$--$27$ events, and a fully
time-resolved treatment to ${\sim}14$--$16$. Event timing thus
probes signal geometry robustly across decay channels and halo
profiles, for any equatorial UHE neutrino telescope.
Authors
Andrew Cheek
(TDLI, SJTU)
Joao Paulo Pinheiro
(TDLI)