Searching for the light leptophilic gauge boson Z _x via four-lepton final states at the CEPC*

Abstract

We investigate the possibility of detecting the leptophilic gauge boson Zx predicted by the U(1)Le-Lμ model via the processes e+e-→ l+l-Zx(Zx→ l+l-) and e+e-→l+l-Zx(Zx→ νlνl) at the Circular Electron Positron Collider (CEPC) with the center of mass energy √s=240 GeV and the luminosity L=5.6 ab-1. We give the expected sensitivities of the CEPC to the parameter space at 1σ, 2σ ,3σ and 5σ levels. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.