Saved in:
| Main Author: | |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.05884 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Table of Contents:
- We investigate the discovery prospects of a leptophilic gauge boson Z_l at future $e^+e^-$ colliders, focusing on a comparative study of the Circular Electron-Positron Collider (CEPC) and the International Linear Collider (ILC). This state can arise from an additional U(1)'_l gauge symmetry under which quarks are neutral and all leptons have a universal charge, motivated by neutrino oscillations and physics beyond the Standard Model. As a clean benchmark we study $e^+e^- \to μ^+μ^-$ including realistic initial state radiation (ISR) and beamstrahlung. We find that CEPC at sqrt(s)=240 GeV can probe couplings down to $g_l \sim 10^{-3}$ for $Z_l$ masses up to about 220 GeV, while the ILC extends the sensitivity to heavier states in the multi-hundred GeV range through its higher sqrt(s) stages. These results highlight the complementarity of circular and linear colliders in testing purely leptophilic interactions. Published in Chinese Physics C 50 (2026) 033104. DOI: 10.1088/1674-1137/ae1de4