Search for Higgs and Z boson decays to J/$\psi$ or $\Upsilon$ pairs in proton-proton collisions at $\sqrt{s}=$ 13 TeV
(2019) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B797, p. 134811 (2019)
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- A search for decays of the Higgs and Z boson to pairs of J/$\psi$ or $\Upsilon$(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 $\Upsilon$(nS) pair channel, the limits are 1.4$\times$ 10$^{-3}$ and 1.5$\times$10$^{-6}$, respectively, when the mesons from the Higgs and Z boson decay are assumed to be unpolarized. When fully longitudinal and transverse polarizations are considered the limits reduce by about 22-29% and increase by about 10-13%, respectively.
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Bondu, O., Bruno, G., Caputo, C., David, P., Delaere, C., Delcourt, M., Giammanco, A., Lemaitre, V., Magitteri, A., Prisciandaro, J., Saggio, A., Vidal Marono, M., Vischia, P., Zobec, J., CMS Collaboration, & et al. (2019). Search for Higgs and Z boson decays to J/$\psi$ or $\Upsilon$ pairs in proton-proton collisions at $\sqrt{s}=$ 13 TeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B797, 134811. https://doi.org/10.1016/j.physletb.2019.134811 (Original work published 2019)