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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 journalJournal article


Journal publication date1991
JournalPhysics Letters B
Number of pages11
Original languageEnglish


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.