Eur. Phys. J. C (2018) 78: 216
https://doi.org/10.1140/epjc/s10052-018-5714-3

Regular Article - Theoretical Physics

Radiative seesaw model and DAMPE excess from leptophilic gauge symmetry

¹ School of Physics and Technology, University of Jinan, Jinan, 250022, Shandong, China
² Department of Physics, North China Electric Power University, Baoding, 071003, China
³ Center for High Energy Physics, Peking University, Beijing, 100871, China

^* e-mail: sps_hanzl@ujn.edu.cn

Received: 20 December 2017
Accepted: 6 March 2018
Published online: 13 March 2018

Abstract

In the light of the excess observed by DAMPE experiment, we propose an anomaly-free radiative seesaw model with an alternative leptophilic gauge symmetry. In the model, only right-handed leptons are charged under 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 charge numbers are assigned to some new particles. After the spontaneous breaking of symmetry, the dark symmetry could appear as a residual symmetry such that the stability of inert particles with irrational charge numbers are guaranteed, naturally leading to stable DM candidates. We show that the Dirac fermion DM contained in the model can explain the DAMPE excess. Meanwhile, experimental constraints from DM relic density, direct detection, LEP and anomalous magnetic moments are satisfied.