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Study of the four fermion final state at the Z resonance

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>1995
<mark>Journal</mark>Zeitschrift für Physik C Particles and Fields
Number of pages16
<mark>Original language</mark>English


The process e+e−→, where l is a charged or a neutral lepton and f any charged fermion, is analyzed. The study uses the ALEPH data collected at LEP from 1989 to 1993 at centre-of-mass energies between 88 and 95 GeV, corresponding to almost two million hadronic Z decays and to a total integrated luminosity of 79 pb−1. For all channels, the data agree well with the standard model expectation both in shape and normalization. The indication of an excess in the e+e−→τ+τ−ffˉ channel, reported by ALEPH in 1991, is not confirmed.