Radiative Seesaw Model and DAMPE Excess from Leptophilic Gauge Symmetry

Understand

In the light of the $e^{+}+e^{-}$ excess observed by DAMPE experiment, we propose an anomaly-free radiative seesaw model with an alternative leptophilic $U(1)_X$ gauge symmetry.

• In the model, only right-handed leptons are charged under $U(1)_X$ symmetry.
• The tiny Dirac neutrino masses are generated at one-loop level and charged leptons acquire masses though the type-I seesaw-like mechanism with heavy intermediate fermions.
• In order to cancel the anomaly, irrational $U(1)_{X}$ charge numbers are assigned to some new particles.