Observation of the Rare Decay $η→{μ}^{+}{μ}^{−}{e}^{+}{e}^{−}$
A first observation of the rare decay $\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}{e}^{+}{e}^{\ensuremath{-}}$ is reported by the CMS Collaboration at the CERN LHC. The result is based on a proton-proton …
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