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| CMS-PAS-HIG-18-025 | ||
| Search for Higgs and Z boson decays to $\mathrm{J}/\psi$ or $\Upsilon$ pairs in proton-proton collisions at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| March 2019 | ||
| Abstract: A search is presented for decays of the Higgs and Z boson to pairs of $\mathrm{J}/\psi$ or $\Upsilon(n\mathrm{S})$ ($n=$ 1, 2, 3), with the subsequent decay of the mesons to $\mu^+\mu^-$. The analysis uses data from proton-proton collisions with an integrated luminosity of 37.5 fb$^{-1}$ at $\sqrt{s}= $ 13 TeV collected with the CMS detector at the LHC in 2017. An observation of such a decay with this sample would indicate the presence of physics beyond the standard model. No significant excess of events is observed and 95% confidence level upper limits are placed on the branching fractions. In the $\mathrm{J}/\psi$ pair final state 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 $\Upsilon(n\mathrm{S})$ pair final states the limits are 1.4$\times 10^{-3} $ and 1.5$\times 10^{-6}$, respectively. The $\mathrm{J}/\psi$ and $\Upsilon(n\mathrm{S})$ mesons from the Higgs and Z decay are assumed unpolarized. With longitudinally polarized $\mathrm{J}/\psi$ and $\Upsilon$ mesons in the Higgs and Z decay the upper limits reduce by about 22-29%, while with transversely polarized mesons the decay limits increase by about 10-13%. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PLB 797 (2019) 134811. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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