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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
  • Brabson, B
  • Breakstone, A
  • Bulos, F
  • Burchat, PR
  • Burke, DL
  • Cence, RJ
  • Chapman, J
  • Chmeissani, M
  • Cords, D
  • Coupal, DP
  • Dauncey, P
  • DeStaebler, HC
  • Dorfan, DE
  • Dorfan, JM
  • Drewer, DC
  • Elia, R
  • Feldman, GJ
  • Fernandes, D
  • Field, RC
  • Ford, WT
  • Fordham, C
  • Frey, R
  • Fujino, D
  • Gan, KK
  • Gero, E
  • Gidal, G
  • Glanzman, T
  • Goldhaber, G
  • Gomez Cadenas JJ
  • Gratta, G
  • Grindhammer, G
  • Grosse-Wiesmann, P
  • Hanson, G
  • Harr, R
  • Harral, B
  • Harris, FA
  • Hawkes, CM
  • Hayes, K
  • Hearty, C
  • Heusch, CA
  • Hildreth, MD
  • Himel, T
  • Hinshaw, DA
  • Hong, SJ
  • Hutchinson, D
  • Hylen, J
  • Innes, WR
  • Jacobsen, RG
  • Jaros, JA
  • Jung, CK
  • Kadyk, JA
  • Kent, J
  • 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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