Abstract
A search for unstable sequential neutral and charged heavy leptons has been made at center-of-mass energies 130 and 136 GeV with the L3 detector at LEP. The neutral leptons are assumed to decay via mixing to electrons and muons. No evidence for their existence was found. We exclude unstable Dirac neutrinos for masses below 59.3 (57.9) GeV and unstable Majorana neutrinos below 48.6 (47.2) GeV if the neutrino couples to the electron(muon) family. We exclude unstable charged heavy leptons for masses below 61 GeV for a wide range of the associated neutral lepton mass.
Original language | English |
---|---|
Pages (from-to) | 304-312 |
Number of pages | 9 |
Journal | Physics Letters B |
Volume | 377 |
Issue number | 4 |
DOIs | |
State | Published - Jun 13 1996 |
Funding
’ Supportedb y the German Bundesministeriumf iir BildungW, is-senschaft, Forschung und Technologie. ’ Supportedb y the Hungarian OTKA fund under contract number T14459. i Supported also by the Comisi6n Interministerial de Ciencia y Technologia. ’ Also supportedb y CONICETa nd Universidad National de La Plats, CC 67, 1900 La Plats, Argentina. 5 Also supportedb y Panjab University, Chandigarh-160014,I ndia.