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

  • Author(s): Abrams, GS
  • Adolphsen, CE
  • Averill, D
  • Ballam, J
  • Barish, BC
  • Barklow, T
  • Barnett, BA
  • Bartelt, J
  • Bethke, S
  • Blockus, D
  • Bonvicini, G
  • Boyarski, A
  • et al.
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/c2 for the top-quark mass, 42.0 GeV/c2 for the mass of a fourth-generation charge -(1/3 quark, and 41.3 GeV/c2 for the mass of an unstable Dirac neutral lepton. © 1989 The American Physical Society.

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