2 research outputs found

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

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    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

    Search for the rare decay D0μ+μD^0 \to \mu^+ \mu^-

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    22 pages, 8 figures, Submitted to Physics Letters BA search for the rare decay D0μ+μD^0 \to \mu^+ \mu^-is performed using a data sample, corresponding to an integrated luminosity of 0.9 fb1^{-1}, of pppp collisions collected at a centre-of-mass energy of 7 TeV by the LHCb experiment. The observed number of events is consistent with the background expectations and corresponds to an upper limit of \mbox{B(D0μ+μ)<6.2(7.6)×109{\cal B}(D^0 \to \mu^+ \mu^-) < 6.2(7.6) \times 10^{-9}} at \mbox{90%} \mbox{(95%)} confidence level. This result represents an improvement of more than a factor twenty with respect to previous measurements
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