Search for the lepton flavor violating decay $\tau$ $\to$ 3$\mu$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

Results are reported from a search for the lepton flavor violating decay $\tau$ $\to$ 3$\mu$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV. The data sample corresponds to an integrated luminosity of 33.2 fb${}^{-1}$ recorded by the CMS experiment at the LHC in 2016. The search exploits $\tau$ leptons produced in both W boson and heavy-flavor hadron decays. No significant excess above the expected background is observed. An upper limit on the branching fraction $\mathcal{B}(\tau$ $\to$ 3$\mu )$ of 8.0 $\times$ 10${}^{-8}$ at 90% confidence level is obtained, with an expected upper limit of 6.9 $\times$ 10${}^{-8}$.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-17-004 (CMS Public Pages)

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• Kinematical Observables in Semi-Invisible Decays
• Search for the charged lepton flavor violating decay $\psi (3686)\to e^{\pm }{\mu }^{\mp }$