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Search for W boson decays to three charged pions

For the first time, a search for the rare decay of the W boson to three charged pions has been performed. Proton-proton collision data recorded by the CMS experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 77.3 fb$^{; ; ; ; -1}; ; ; ; $, have been analyzed. No significant excess is observed above the background expectation. An upper limit of 1.01 $\times$ 10$^{; ; ; ; -6}; ; ; ; $ is set at 95% confidence level on the branching fraction of the W boson to three charged pions. This provides a strong motivation for theoretical calculations of this branching fraction.

High energy physics ; Experimental particle physics ; LHC ; CMS ; Physics ; Beyond two generations ; Excited top quark ; Hadron-Hadron scattering (experiments) ; Supersymmetry ; Beyond Standard Model ; Lepton production ; Data acquisition concepts ; Detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases) ; Modular electronics ; Optical detector readout concepts ; Particle Physics Experiments ; Data ; Higgs ; Muon

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