Cutoff of IceCube Neutrino Spectrum due to t-channel Resonant Absorption by C$\nu$B

TL;DR

This paper proposes a t-channel neutrino absorption mechanism involving a new scalar particle to explain the cutoff in the IceCube neutrino spectrum at 4.5 PeV, addressing the non-observation at the Glashow resonance.

Contribution

It introduces a neutrinophilic 2HDM with a low-scale seesaw and a scalar mediator that explains both neutrino spectrum cutoff and dark matter relic density.

Findings

Predicts a neutrino spectrum cutoff at 4.5 PeV due to t-channel absorption.

Provides a model linking neutrino mass generation and dark matter annihilation.

Explains the absence of Glashow resonance events in IceCube data.

Abstract

The non-observation of neutrinos by the IceCube at the Glashow resonance energy of 6.3 PeV has been a long standing unresolved issue. In this paper we propose a t-channel neutrino absorption by the C$\nu$B, which causes a cutoff at 4.5 PeV neutrino energy, to explain the IceCube observations. We present a neutrinophilic 2HDM where the neutrino masses are generated by a low scale seesaw mechanism. A $\mathcal{O}$(10) MeV scalar mediates the interactions between left and right handed neutrinos and generates the t-channel diagram used for explaining the absence of Glashow resonance. The same scalar mediates the annihilation of the dark matter and generates the correct relic density.