Search for neutral heavy leptons produced in Z decays

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1997) Zeitschrift für Physik. C, Particles and fields — Vol. 74, p. 57-71 (1997)

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Abstract
Weak isosinglet Neutral Heavy Leptons (m) have been searched for using data collected by the DELPHI detector corresponding to 3:3 106 hadronic Z0 decays at LEP1. Four separate searches have been performed, for short-lived m production giving monojet or acollinear jet topologies, and for long-lived m giving detectable secondary vertices or calorimeter clusters. No indication of the existence of these particles has been found, leading to an upper limit for the branching ratio BR(Z0 ! m) of about 1:310−6 at 95% confidence level for m masses between 3.5 and 50 GeV/c2. Outside this range the limit weakens rapidly with the m mass. The results are also interpreted in terms of limits for the single production of excited neutrinos.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1997). Search for neutral heavy leptons produced in Z decays. Zeitschrift für Physik. C, Particles and fields, 74, 57-71. https://doi.org/10.1007/s002880050370 (Original work published 1997)