Probing lepton flavour violation via neutrinoless $\tau ⟶3\mu$ 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, $\mathrm{Br}(\tau \to 3\mu )$, is $3.76\times 10^{-7}$ ($3.94\times 10^{-7}$) at 90% confidence level.

21 pages plus author list + cover pages (39 pages total), 6 figures, 2 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-14/

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