# IOP 2014 Joint HEPP & APP Group Meeting

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
15m
Room D (Windsor Building)

### Room D

#### Windsor Building

contributed talk Flavour Physics and Beyond

### Speaker

Jon Harrison (University of Manchester (GB))

### Description

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))

 Slides