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Probing lepton flavour violation via neutrinoless τ⟶3μ decays with the ATLAS detector

Research output: Contribution to journalJournal article

  • ATLAS Collaboration
Article number232
<mark>Journal publication date</mark>05/2016
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number5
Number of pages25
Publication statusPublished
Original languageEnglish


This article presents the sensitivity of the ATLAS experiment to the lepton-flavour-violating decays of τ→3μ. A method utilising the production of τ leptons via W→τν decays is used. This method is applied to the sample of 20.3 fb−1 of pp collision data at a centre-of-mass energy of 8 TeV collected by the ATLAS experiment at the LHC in 2012. No event is observed passing the selection criteria, and the observed (expected) upper limit on the τ lepton branching fraction into three muons, Br(τ→3μ), is 3.76×10−7 (3.94×10−7) at 90 % confidence level.