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

ALEPH Collaboration (1991) Charged particle pair production associated with a lepton pair in Z decays: Indication of an excess in the tau channel. Physics Letters B, 263 (1). pp. 112-122. ISSN 0370-2693

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.