A Direct Search for New Charged Heavy Leptons at {LEP}

Results are presented from a search for a new charged heavy lepton in e + e − annihilation. The data were taken with the OPAL detector at LEP during a scan of the Z 0 resonance. Two independent search techniques were used, one looking for events with large missing energy and missing momentum transverse to the beam, and the other for events with isolated energetic leptons. Two candidate events, consistent with expected background, were found in the first search; none was found in the second. These results allow the exclusion at the 95% confidence level of a charged heavy lepton of mass less than 44.3 GeV/ c 2 if it is assumed to have a massless neutrino partner. Limits are also presented for the case of a massive neutrino.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: leptonic decay
leptonic decay: Z0
heavy lepton: search for
transverse momentum: missing-energy

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