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First observation of the rare $4\mu$ decay of the $\eta$ meson
The first observation of the double-Dalitz decay $\eta \rightarrow \mu^+\mu^-\mu^+\mu^-$ is reported with 2017 and 2018 data by the CMS experiment at the CERN LHC. A signal having a statistical significance well in excess of 5 standard deviations was identified using high-rate muon trigger data coll...
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2023
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| Acceso en línea: | http://cds.cern.ch/record/2850937 |