We look at the prospects for detecting light bosons, $X$, at proposed Z factories assuming a production of $10^{12}$ Z bosons. Such a large yield is within the design goals of future FCC-ee and CEPC colliders. Specifically, we look at the cases where $X$ is either a singlet scalar that mixes with the standard model Higgs or a vector boson with mass $1\lesssim M_X\lesssim 80\mathrm{GeV}$. We find that several channels are particularly promising for discovery prospects. In particular, $Z\to f\overline{f}X$ and $Z\to V_{Q}X$ give a promising signal above a very clean standard model background. We also discuss several channels that have too large a background to be useful.

• Received 8 March 2018

DOI:https://doi.org/10.1103/PhysRevD.97.115015

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society