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

LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb. Physics Letters B, 724(1-3):36-45.

## Abstract

Searches for the lepton flavour violating decay τ−→μ−μ+μ−τ−→μ−μ+μ− and the lepton flavour and baryon number violating decays sourceτ−→p¯μ+μ− and τ−→pμ−μ−τ−→pμ−μ− have been carried out using proton–proton collision data, corresponding to an integrated luminosity of 1.0 fb−11.0 fb−1, taken by the LHCb experiment at s=7 TeV. No evidence has been found for any signal, and limits have been set at 90%90% confidence level on the branching fractions: B(τ−→μ−μ+μ−)<8.0×10−8B(τ−→μ−μ+μ−)<8.0×10−8, B(τ−→p¯μ+μ−)<3.3×10−7 and B(τ−→pμ−μ−)<4.4×10−7B(τ−→pμ−μ−)<4.4×10−7. The results for the τ−→p¯μ+μ− and τ−→pμ−μ−τ−→pμ−μ− decay modes represent the first direct experimental limits on these channels.

## Abstract

Searches for the lepton flavour violating decay τ−→μ−μ+μ−τ−→μ−μ+μ− and the lepton flavour and baryon number violating decays sourceτ−→p¯μ+μ− and τ−→pμ−μ−τ−→pμ−μ− have been carried out using proton–proton collision data, corresponding to an integrated luminosity of 1.0 fb−11.0 fb−1, taken by the LHCb experiment at s=7 TeV. No evidence has been found for any signal, and limits have been set at 90%90% confidence level on the branching fractions: B(τ−→μ−μ+μ−)<8.0×10−8B(τ−→μ−μ+μ−)<8.0×10−8, B(τ−→p¯μ+μ−)<3.3×10−7 and B(τ−→pμ−μ−)<4.4×10−7B(τ−→pμ−μ−)<4.4×10−7. The results for the τ−→p¯μ+μ− and τ−→pμ−μ−τ−→pμ−μ− decay modes represent the first direct experimental limits on these channels.

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