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# Search for the lepton flavour violating decay $\tau^-\to \mu^-\mu^+\mu^-$

Abstract : A search for the lepton flavour violating decay $\tau^-\to \mu^-\mu^+\mu^-$ is performed with the LHCb experiment. The data sample corresponds to an integrated luminosity of $1.0\mathrm{\,fb}^{-1}$ of proton-proton collisions at a centre-of-mass energy of $7\mathrm{\,Te\kern -0.1em V}$ and $2.0\mathrm{\,fb}^{-1}$ at $8\mathrm{\,Te\kern -0.1em V}$. No evidence is found for a signal, and a limit is set at $90\%$ confidence level on the branching fraction, $\mathcal{B}(\tau^-\to \mu^-\mu^+\mu^-) < 4.6 \times 10^{-8}$.
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Journal articles
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http://hal.in2p3.fr/in2p3-01070299
Contributor : Danielle Cristofol Connect in order to contact the contributor
Submitted on : Wednesday, October 1, 2014 - 9:27:10 AM
Last modification on : Thursday, December 16, 2021 - 2:11:16 PM

### Citation

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, A. Affolder, et al.. Search for the lepton flavour violating decay $\tau^-\to \mu^-\mu^+\mu^-$. Journal of High Energy Physics, Springer, 2015, 2015 (02), pp.121. ⟨10.1007/JHEP02(2015)121⟩. ⟨in2p3-01070299⟩

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