Observation of the J/$\psi$ $\to$ ${\mu }^{+}{\mu }^{-}{\mu }^{+}{\mu }^{-}$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

The J/$\psi$ $\to$ ${\mu }^{+}{\mu }^{-}{\mu }^{+}{\mu }^{-}$ decay has been observed with a statistical significance in excess of five standard deviations. The analysis is based on an event sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment in 2018 and corresponding to an integrated luminosity of 33.6 fb${}^{-1}$. Normalizing to the J/$\psi$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay mode leads to a branching fraction [10.1 ${}_{-2.7}^{+3.3}$ (stat) $\pm$ 0.4 (syst)] $\times$ 10${}^{-7}$, a value that is consistent with the standard model prediction.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-22-006 (CMS Public Pages)

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