The Leptonic Higgs as a Messenger of Dark Matter

TL;DR

This paper links cosmic ray signals from dark matter to Higgs sector signals at the LHC, proposing a leptonic Higgs doublet as the mediator for dark matter annihilation or decay, with testable predictions for collider and cosmic observations.

Contribution

It introduces a model where a leptonic Higgs doublet mediates dark matter interactions, connecting cosmic ray anomalies to collider signals and predicting observable photon and neutrino signals.

Findings

Leptonic Higgs doublet models explain cosmic ray excesses.

Predicted large tau lepton events at the LHC.

Cosmic photon and neutrino signals are near detection thresholds.

Abstract

We propose that the leptonic cosmic ray signals seen by PAMELA and ATIC result from the annihilation or decay of dark matter particles via states of a leptonic Higgs doublet to $\tau$ leptons, linking cosmic ray signals of dark matter to LHC signals of the Higgs sector. The states of the leptonic Higgs doublet are lighter than about 200 GeV, yielding large $\bar{\tau} \tau$ and $\bar{\tau} \tau \bar{\tau} \tau$ event rates at the LHC. Simple models are given for the dark matter particle and its interactions with the leptonic Higgs, for cosmic ray signals arising from both annihilations and decays in the galactic halo. For the case of annihilations, cosmic photon and neutrino signals are on the verge of discovery.