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We look at the prospects for detecting light bosons, $X$, at proposed Zfactories assuming a production of $10^{12}$ Z bosons. Such a large yield iswithin the design goals of future FCC-ee and CEPC colliders. Specifically welook at the cases where $X$ is either a singlet scalar which mixes with thestandard model Higgs or a vector boson with mass $1\lesssim M_X \lesssim 80$GeV. We find that several channels are particularly promising for discoveryprospects. In particular $Z\rightarrow f \bar{f} X$ and $Z \rightarrow V_Q X$gives a promising signal above a very clean standard model background. We alsodiscuss several channels that have too large a background to be useful.

Prospects for Detecting light bosons at the FCC-ee and CEPC