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 $7\mathrm{Te}\mathrm{V}$ and $2.0{\mathrm{fb}}^{-1}$ at $8\mathrm{Te}\mathrm{V}$. No evidence is found for a signal, and a limit is set at $90\%$ confidence level on the branching fraction, $\mathcal{B}({\tau }^{-}\to {\mu }^{-}{\mu }^{+}{\mu }^{-})<4.6\times 10^{-8}$.

20 pages, 10 figures, published as JHEP 02 (2015) 121

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