Search for neutral heavy leptons produced in Z decays
Collaboration
27 pages
Published in:
- Z.Phys.C 74 (1997) 57-71,
- Z.Phys.C 75 (1997) 580 (erratum)
DOI:
- 10.1007/s002880050370,
- 10.1007/BF03546181 (erratum)
PDG: Limits on
Report number:
- CERN-PPE-96-195
Experiments:
View in:
Citations per year
Loading ...
Abstract: (Springer)
Weak isosinglet Neutral Heavy Leptons (vm) 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 vm production giving monojet or acollinear jet topologies, and for long-lived vm 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 → vm?) of about 1.3 × 10−6 at 95% confidence level for vm masses between 3.5 and 50 GeV/c2. Outside this range the limit weakens rapidly with the vm mass. The results are also interpreted in terms of limits for the single production of excited neutrinos.- electron positron: colliding beams
- electron positron: annihilation
- Z0: electroproduction
- Z0: leptonic decay
- heavy lepton: search for
- neutrino: pair production
- neutrino: massive
- neutrino: decay
- neutrino: excited state
- neutrino: lifetime
References(0)
Figures(0)
Loading ...