New Search for Monochromatic Neutrinos from Dark Matter Decay

TL;DR

This paper uses IceCube data to set new, more stringent limits on monochromatic neutrino signals from dark matter decay, improving previous bounds by over an order of magnitude and finding no evidence of such signals.

Contribution

It provides the first comprehensive bounds on neutrino lines from dark matter decay in the TeV to tens of TeV range, surpassing previous limits.

Findings

New bounds on neutrino lines are more than ten times stronger than previous limits.

No significant neutrino line signals were detected in the data.

Constraints now comparable to gamma-ray line limits at similar energies.

Abstract

From data recently reported from the IceCube telescope, we derive new bounds on the monochromatic neutrino signal produced from dark matter particle decays. In the few TeV to tens of TeV energy range, these bounds turn out to be better than previous limits by more than an order of magnitude. As a result, intensity constraints on neutrino lines at energies above a few TeV are now comparable to those on gamma-ray lines. From the same data sample, we also perform a detailed search for a neutrino line, showing that there is no significant hint for such a signal.