Abstract
We analyze the capacity of future Z-factories to search for heavy neutrinos with their mass from 10 to 85 GeV. The heavy neutrinos N are considered to be produced via the process e^+e^-rightarrow Zrightarrow nu N and to decay into an electron or muon and two jets. By means of Monte Carlo simulation of such signal events and the Standard Model background events, we obtain the upper bounds on the cross sections sigma (e^+e^-rightarrow nu Nrightarrow nu ell jj) given by the Z-factories with integrated luminosities of 0.1, 1 and 10 hbox {ab}^{-1} if no signal events are observed. Under the assumption of a minimal extension of the Standard Model in the neutrino sector, we also present the corresponding constraints on the mixing parameters of the heavy neutrinos with the Standard Model leptons, and find they are improved by at least one order compared to current experimental constraints.
Highlights
There have been direct searches for heavy neutrinos with O(10) GeV mass by the DELPHI Collaboration [21]
We estimate the expected upper bounds on the cross sections σ (e+e− → ν N → ν j j ) at 95% confidence level (CL), which can be approximately obtained by solving the equation s = √ Ns
We have presented a study of possible heavy neutrino searches at future Z -factories
Summary
There have been direct searches for heavy neutrinos with O(10) GeV mass by the DELPHI Collaboration [21]. In their searches, the heavy neutrinos were considered to be produced via the e+e− → Z → ν N process and decay into visible final states. Heavy neutrinos in a model with a Majoron J [46,47], which was introduced to generate the Majorana scale in an ultraviolet-complete way, have such a feature They can efficiently decay into the light Majoron via the invisible channels N → ν J and have short lifetimes.
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