Leptophilic dark matter in gauged U(1)Le-Lμ model in light of DAMPE cosmic ray e + + e - excess
Journal
European Physical Journal C
Journal Volume
381
Journal Issue
21
Date Issued
2017
Author(s)
Abstract
Motivated by the very recent cosmic-ray electron+positron excess observed by DAMPE collaboration, we investigate a Dirac fermion dark matter (DM) in the gauged Le-Lμ model. DM interacts with the electron and muon via the U(1) e-μ gauge boson Z′. The model can explain the DAMPE data well. Although a non-zero DM-nucleon cross section is only generated at one loop level and there is a partial cancellation between Z′ee and Z′μμ couplings, we find that a large portion of Z′ mass is ruled out from direct DM detection limit leaving the allowed Z′ mass to be close to two times of the DM mass. Implications for pp→ Z′→ 2 ℓ and pp→ 2 ℓ+ Z′, and muon g- 2 anomaly are also studied.
Type
journal article