Search for the lepton flavour violating decay τ → μμ+μ

The LHCb Collaboration

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A search for the lepton flavour violating decay τ − → µ −µ +µ − is performed with the LHCb experiment. The data sample corresponds to an integrated luminosity of 1.0 fb−1 of proton-proton collisions at a centre-of-mass energy of 7 TeV and 2.0 fb−1 at 8 TeV. No evidence is found for a signal, and a limit is set at 90% confidence level on the branching fraction, B(τ− → µ−µ+µ−) < 4.6 × 10−8.
Original languageEnglish
Number of pages20
JournalJournal of High Energy Physics
Issue number2
Publication statusPublished - 2015
Externally publishedYes


  • Rare decay
  • Tau Physics
  • Hadron-Hadron Scattering

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