Tau Decays into Three Charged Leptons and Two Neutrinos

CLEO Collaboration

Research output: Contribution to journalArticlepeer-review


We search for the radiative leptonic tau decays τ→ee+eντνe and τ→μe+eντνμ using 3.60fb−1 of data collected by the CLEO-II experiment at the Cornell Electron Storage Ring. We present a first observation of the τ→ee+eντνe process. For this channel we measure the branching fraction B(τ→ee+eντνe) = (2.7+1.5+0.4+0.1−1.1−0.4−0.3)×10−5. An upper limit is established for the second channel: B(τ→μe+eντνμ) < 3.2 × 10−5 at 90% C.L. Both results are consistent with the rates expected from standard model predictions.

Original languageEnglish (US)
Pages (from-to)2637-2641
Number of pages5
JournalPhysical review letters
Issue number15
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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