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Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb

Abstract : Searches for the lepton flavour violating decay $\tau^-\rightarrow \mu^-\mu^+\mu^-$ and the lepton flavour and baryon number violating decays $\tau^-\rightarrow \bar{p}\mu^+\mu^-$ and $\tau^-\rightarrow p\mu^-\mu^-$ have been carried out using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, taken by the LHCb experiment at $\sqrt{s} = 7$ TeV. No evidence has been found for any signal, and limits have been set at 90% confidence level on the branching fractions: $\cal B(\tau^-\rightarrow \mu^-\mu^+\mu^-) < 8.0 \times 10^{-8}$, $\cal B(\tau^-\rightarrow \bar{p}\mu^+\mu^-) < 3.3 \times 10^{-7}$ and $\cal B(\tau^-\rightarrow p\mu^-\mu^-) < 4.4 \times 10^{-7}$. The results for the $\tau^-\rightarrow \bar{p}\mu^+\mu^-$ and $\tau^-\rightarrow p\mu^-\mu^-$ decay modes represent the first direct experimental limits on these channels.
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http://hal.in2p3.fr/in2p3-00815069
Contributor : Sabine Starita <>
Submitted on : Thursday, April 18, 2013 - 10:35:20 AM
Last modification on : Wednesday, September 16, 2020 - 4:19:33 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb. Physics Letters B, Elsevier, 2013, 724, pp.36-45. ⟨10.1016/j.physletb.2013.05.063⟩. ⟨in2p3-00815069⟩

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