# Probing lepton flavour violation via neutrinoless $\tau\longrightarrow 3\mu$ decays with the ATLAS detector

Abstract : This article presents the sensitivity of the ATLAS experiment to the lepton-flavour-violating decays of $\tau\to 3\mu$. A method utilising the production of $\tau$ leptons via $W\to\tau\nu$ 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 $\tau$ lepton branching fraction into three muons, ${\rm Br}(\tau\to 3\mu)$, is $3.76\times 10^{-7}$ ($3.94\times 10^{-7}$) at 90% confidence level.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01256579
Contributor : Sabine Starita <>
Submitted on : Friday, January 15, 2016 - 9:17:44 AM
Last modification on : Tuesday, May 11, 2021 - 11:36:47 AM

### Citation

G. Aad, M.K. Ayoub, A. Bassalat, C. Bécot, S. Binet, et al.. Probing lepton flavour violation via neutrinoless $\tau\longrightarrow 3\mu$ decays with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2016, 76, pp.232. ⟨10.1140/epjc/s10052-016-4041-9⟩. ⟨in2p3-01256579⟩

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