Karapınar, GülerCMS Collaboration2020-07-182020-07-1820190031-90071079-7114https://doi.org/10.1103/PhysRevLett.122.151802https://hdl.handle.net/11147/8541PubMed: 31050519For 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 x 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.eninfo:eu-repo/semantics/openAccessArticle2-s2.0-8506555680610.1103/PhysRevLett.122.151802