Search for W boson decays to three charged pions

Albert M Sirunyan, Armen Tumasyan, Wolfgang Adam, Federico Ambrogi, Ece Asilar, Thomas Bergauer, Johannes Brandstetter, Marko Dragicevic, Janos Erö, Alberto Escalante Del Valle, Martin Flechl, Rudolf Fruehwirth, Vasile Mihai Ghete, Josef Hrubec, Manfred Jeitler, Natascha Krammer, Ilse Krätschmer, Dietrich Liko, Thomas Madlener, Ivan Mikulec, Navid Rad, Herbert Rohringer, Jochen Schieck, Robert Schöfbeck, Markus Spanring … & Nathaniel Woods
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...
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