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

Abstract

We study the recent e±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 μ→3e\mu \to 3 e. We also discuss possible collider signatures of our model, both at the LHC and a future 100 TeV hadron collider.Comment: invited by Science China, accepted versio

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