Lepton-portal Dark Matter in Hidden Valley model and the DAMPE recent results

TL;DR

This paper proposes a lepton-portal dark matter model within a Hidden Valley framework to explain DAMPE's recent cosmic ray excess, demonstrating compatibility with relic density and detection bounds, and exploring collider signatures.

Contribution

It introduces a lepton-portal dark matter model that accounts for cosmic ray excesses and analyzes its experimental constraints and collider prospects.

Findings

Electron-portal explains DAMPE excess effectively.

Electron+muon/electron+muon+tau portals face strong flavor violation constraints.

Model predicts detectable collider signatures at LHC and future colliders.

Abstract

We study the recent $e^\pm$ cosmic ray excess reported by DAMPE in a Hidden Valley Model with lepton-portal dark matter. We find the electron-portal can account for the excess well and satisfy the DM relic density and direct detection bounds, while electron+muon/electron+muon+tau-portal suffers from strong constraints from lepton flavor violating observables, such as $\mu \to 3 e$. We also discuss possible collider signatures of our model, both at the LHC and a future 100 TeV hadron collider.