Eur. Phys. J. C (2018) 78: 323
https://doi.org/10.1140/epjc/s10052-018-5805-1

Regular Article - Theoretical Physics

Leptophilic dark matter in gauged model in light of DAMPE cosmic ray excess

¹ Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210023, Jiangsu, China
² CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Academia Sinica, Beijing, 100190, China
³ School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
⁴ Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
⁵ Physics Division, National Center for Theoretical Sciences, Hsinchu, 30013, Taiwan
⁶ T-D Lee Institute, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China
⁷ Department of Physics, Tohoku University, Sendai, 980-8578, Japan

^* e-mail: leiwu@itp.ac.cn

Received: 15 December 2017
Accepted: 12 April 2018
Published online: 21 April 2018

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 model. DM interacts with the electron and muon via the gauge boson . 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 and couplings, we find that a large portion of mass is ruled out from direct DM detection limit leaving the allowed mass to be close to two times of the DM mass. Implications for and , and muon anomaly are also studied.