Search for Higgs and Z boson decays to J/$\psi$ or ${\rm Y}$ pairs in the four-muon final state in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search for decays of the Higgs and Z boson to pairs of J/$\psi$ or ${\rm Y}$(nS) (n = 1, 2, 3) mesons, with their subsequent decay to ${\mu }^{+}{\mu }^{-}$ pairs, is presented. The analysis uses data from proton-proton collisions at $\sqrt{s}=$ 13 TeV, collected with the CMS detector at the LHC in 2017 and corresponding to an integrated luminosity of 37.5 fb${}^{-1}$. While an observation of such a decay with this sample would indicate the presence of physics beyond the standard model, no significant excess is observed. Upper limits at 95% confidence level are placed on the branching fractions of these decays. In the J/$\psi$ pair channel, the limits are 1.8 $\times$ 10${}^{-3}$ and 2.2 $\times$ 10${}^{-6}$ for the Higgs and Z boson, respectively, while in the combined ${\rm Y}$(nS) pair channel, the limits are 1.4 $\times$ 10${}^{-3}$ and 1.5 $\times$ 10${}^{-6}$, respectively, when the mesons from the Higgs and Z boson decay are assumed to be unpolarized. When fully longitudinal and transverse polarizations are considered the limits reduce by about 22-29% and increase by about 10-13%, respectively.

Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-18-025 (CMS Public Pages)

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• Relativistic corrections to paired production of charmonium and bottomonium in decays of the Higgs boson
• Higgs boson decay to the pair of S- and P-wave $B_c$ mesons
• Note on rare $Z$-boson decays to double heavy quarkonia
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• Associated charmonium-bottomonium production in a single boson $e^{+}{e}^{-}$ annihilation
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• Identifying hadronic charmonium decays in hadron colliders