Signature of heavy sterile neutrinos at CEPC

Abstract

We study the production of heavy sterile neutrino $N$, $e^{+}{e}^{-}\to N\nu (\bar{\nu })$, at the Circular Electron Positron Collider(CEPC) and its $ljj$ signal in its decay to three charged fermions. We study background events for this process which are mainly events coming from W pair production. We study the production of a single heavy sterile neutrino and the sensitivity of CEPC to the mixing of sterile neutrino with active neutrinos. We study the production of two degenerate heavy sterile neutrinos in a low energy see-saw model by taking into account the constraints on mixings of sterile neutrinos from the neutrino-less double $\beta$ decay experiment and the masses and mixings of active neutrinos. We show that CEPC under proposal has a good sensitivity to the mixing of sterile neutrinos with active neutrinos for a mass of sterile neutrino around 100 GeV.

24 pages, 11 figures, 1 table, published version

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• Lepton collider probes for Majorana neutrino effective interactions
• Neutrino counting experiments and non-unitarity from LEP and future experiments
• New Physics Search at the CEPC: a General Perspective
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• Sensitivity Reach on the Heavy Neutral Leptons and $\tau$-Neutrino Mixing $|U_{\tau N}{|}^2$ at the HL-LHC
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