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A search for new quarks and leptons from Z0 decay at LEP

Decamp, D. and Finch, Alexander (1990) A search for new quarks and leptons from Z0 decay at LEP. Physics Letters B, 236 (4). pp. 511-522. ISSN 0370-2693

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Abstract

A search for Z0 decays into pairs of possible new heavy quarks (t and b′), new heavy charged leptons (L±), stable heavy neutral leptons (νL) and unstable heavy neutral leptons (L0) is performed on data collected by the ALEPH detector corresponding to 11 550 events of Z0→hadrons. The limits on the masses of the heavy quarks are Mt > 45.8 GeV and Mb′ > 46.0 GeV, allowing for both charged-current and flavor-changing neutral-current decays of the b′. If an L± decays into a stable νL, then for MνL<42.7 GeV, the mass of L± is excluded for all values of ML± > MνL. Finally, while the mass of the stable νL is excluded up to 42.7 GeV, the mass of the unstable L0 is excluded up to 45.7 GeV with the mixing parameters |UℓL0|2 down to 10−13 at this mass. For 25.0 GeV < ML0 < 42.7 GeV, all values of |UℓL0|2 are excluded. All limits are given at 95% CL.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63822
Deposited By: ep_importer_pure
Deposited On: 02 May 2013 15:23
Refereed?: Yes
Published?: Published
Last Modified: 30 Aug 2017 14:05
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63822

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