Abstract
For the first time, a search for the rare decay of the 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 , have been analyzed. No significant excess is observed above the background expectation. An upper limit of is set at 95% confidence level on the branching fraction of the boson to three charged pions. This provides a strong motivation for theoretical calculations of this branching fraction.
- Received 30 January 2019
DOI:https://doi.org/10.1103/PhysRevLett.122.151802
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© 2019 CERN, for the CMS Collaboration