Apr 7 – 9, 2014
Royal Holloway, University of London
Europe/London timezone
Institute of Physics 2014 Joint High Energy Particle Physics and Astro Particle Physics Groups Annual Meeting

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

Apr 8, 2014, 5:45 PM
Room D (Windsor Building)

Room D

Windsor Building

contributed talk Flavour Physics and Beyond Parallel 2D


Jon Harrison (University of Manchester (GB))


We report on searches for the lepton-flavour violating decay $\tau^-\rightarrow\mu^-\mu^+\mu^-$ and the lepton-flavour and baryon-number violating decays $\tau^-\rightarrow p\mu^-\mu^-$ and $\tau^-\rightarrow\bar{p}\mu^+\mu^-$, carried out using 1.0 inverse femtobarn of proton-proton collision data taken by the LHCb experiment at 7 TeV during 2011. No evidence has been found for any signal, and limits have been set at 90% confidence level on the branching fractions: BF($\tau^-\rightarrow\mu^-\mu^+\mu^-$) $< 8.0 \times 10^{-8}$, BF($\tau^-\rightarrow p\mu^-\mu^-$) $< 3.3 \times 10^{-7}$ and BF($\tau^-\rightarrow\bar{p}\mu^+\mu^-$) < $4.6 \times 10^{-7}$. The result for BF($\tau^-\rightarrow\mu^-\mu^+\mu^-$) is consistent with previous limits, while the measurements of the $\tau^-\rightarrow p\mu^-\mu^-$ and $\tau^-\rightarrow\bar{p}\mu^+\mu^-$ decay modes represent the first experimental limits on these channels.

Primary author

Jon Harrison (University of Manchester (GB))

Presentation materials