Using a simplified framework , we attempt to explain the recent DAMPE cosmic e ^ { + } + e ^ { - } flux excess by leptophilic Dirac fermion dark matter ( LDM ) .
The scalar ( \Phi _ { 0 } ) and vector ( \Phi _ { 1 } ) mediator fields connecting LDM and Standard Model particles are discussed .
We find that the couplings P \otimes S , P \otimes P , V \otimes A and V \otimes V can produce the right bump in e ^ { + } + e ^ { - } flux for a DM mass around 1.5 TeV with a natural thermal annihilation cross-section < \sigma v > \sim 3 \times 10 ^ { -26 } cm ^ { 3 } / s today .
Among them , V \otimes V coupling is tightly constrained by PandaX-II data ( although LDM-nucleus scattering appears at one-loop level ) and the surviving samples appear in the resonant region , m _ { \Phi _ { 1 } } \simeq 2 m _ { \chi } .
We also study the related collider signatures , such as dilepton production pp \to \Phi _ { 1 } \to \ell ^ { + } \ell ^ { - } , and muon g - 2 anomaly .
Finally , we present a possible U ( 1 ) _ { X } realization for such leptophilic dark matter .