Searches for New Quarks and Leptons Produced in Z-Boson Decay

Creators: Abrams, G. S.; Barish, B. C.; Hawkes, C. M.; Kuhlen, M.; McKenna, J. A.; Milliken, B. D.; Peck, C.; Porter, F. C.; Soderstrom, E.; Stroynowski, R.; Weir, A. J.; Wicklund, E.; Wu, D. Y.; Weinstein, Alan J.

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.

Additional Information

© 1989 The American Physical Society. Received 13 October 1989; published in the issue dated 27 November 1989. We express our appreciation to the dedicated efforts of the staff of SLAC and collaborating universities who made the SLC and these results possible. This work was supported in part by Department of Energy Contracts No. DE-AC03-81ER40050 (California Institute of Technology), No. DE-AM03-76SF00010 (University of California, Santa Cruz), No. DE-AC02-86ER40253 (University of Colorado), No. DE-AC03-83ER40103 (University of Hawaii), No. DE-AC02-84ER40125 Ondiana University), No. DE-AC03-76SF00098 (LBL), No. DE-AC02-76ER01112 (University of Michigan), and No. DE-AC03-76SF00515 (SLAC), and by the National Science Foundation (Johns Hopkins University).

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