# Search for unstable sequential neutral and charged heavy leptons in e$^+$e$^-$ annihilation at $\sqrt{s}$ = 130 GeV and 136 GeV

3 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
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 m
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00023157
Contributor : Sylvie Flores <>
Submitted on : Tuesday, February 16, 1999 - 10:57:31 AM
Last modification on : Friday, December 4, 2020 - 1:22:16 PM

### Citation

M. Acciarri, A. Adam, O. Adriani, M. Aguilar-Benitez, S. Ahlen, et al.. Search for unstable sequential neutral and charged heavy leptons in e$^+$e$^-$ annihilation at $\sqrt{s}$ = 130 GeV and 136 GeV. Physics Letters B, Elsevier, 1996, 377, pp.304-312. ⟨10.1016/0370-2693(96)00466-2⟩. ⟨in2p3-00023157⟩

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