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

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}; ; ; $.

High energy physics ; Experimental particle physics ; LHC ; CMS ; Hadron-Hadron scattering (experiments) ; Higgs physics ; p p: colliding beams ; Higgs particle: pair production ; bottom: 2 ; p p: scattering ; Higgs particle: coupling ; Higgs particle: hadroproduction ; Higgs particle: decay modes ; bottom: pair production ; photon: pair production ; top: pair production ; coupling: Yukawa ; coupling constant: upper limit ; vector boson: fusion ; mass spectrum: two-photon ; Standard model

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