Neutrino Masses, Leptogenesis and Decaying Dark Matter

TL;DR

This paper proposes a simple extension of the standard model that simultaneously explains neutrino masses, dark matter, and the matter-antimatter asymmetry, linking leptogenesis and decaying dark matter to observed cosmic ray excesses.

Contribution

It introduces a model connecting neutrino masses, leptogenesis, and decaying dark matter, with testable predictions at colliders and implications for cosmic ray observations.

Findings

Dark matter decay explains electron and positron excesses in Fermi and PAMELA data.

Model predicts new particles accessible at the Large Hadron Collider.

Leptogenesis successfully accounts for the matter-antimatter asymmetry.

Abstract

We study a simple extension of the standard model to simultaneously explain neutrino masses, dark matter and the matter-antimatter asymmetry of the Universe. In our model, the baryon asymmetry is achieved by the leptogenesis mechanism, while the decaying dark matter with the lifetime of O(10^26 s) provides a natural solution to the electron and positron excesses in Fermi and PAMELA satellite experiments. In particular, we emphasize that our model is sensitive to the structure at the endpoint around 1 TeV of the Fermi data. In addition, some of new particles proposed in the model are within the reach at the near future colliders, such as the Large Hadron Collider.