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Charged particle pair production associated with a lepton pair in Z decays: Indication of an excess in the tau channel

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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  • ALEPH Collaboration
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<mark>Journal publication date</mark>1991
<mark>Journal</mark>Physics Letters B
Issue number1
Volume263
Number of pages11
Pages (from-to)112-122
Publication StatusPublished
<mark>Original language</mark>English

Abstract

In a sample of 200 000 Z decays, events with two leptons and an additional pair of charged particles are studied. The 35 events found show a possible excess in the tau channel compared with the expectation from electroweak processes. The features of the events are consistent with radiation of virtual photons.