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/ for the top-quark mass, 42.0 GeV/ for the mass of a fourth-generation charge -(1/3 quark, and 41.3 GeV/ for the mass of an unstable Dirac neutral lepton.
- Received 13 October 1989
DOI:https://doi.org/10.1103/PhysRevLett.63.2447
©1989 American Physical Society