Searches for new quarks and leptons produced in Z-boson decay

Open Access

27 November 1989

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 63 (22) , 2447-2451
https://doi.org/10.1103/physrevlett.63.2447

Abstract

We have searched for events with new-particle topologies in 390 hadronic Z decays with the Mark II detector at the SLAC Linear Collider. We place 95%-confidence-level lower limits of 40.7 GeV/

c^{2}

for the top-quark mass, 42.0 GeV/

c^{2}

for the mass of a fourth-generation charge -(1/3 quark, and 41.3 GeV/

c^{2}

for the mass of an unstable Dirac neutral lepton.

Keywords

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