Observation of the $\hat{I}{›}_{\mathrm{b}}^0$ $\to$ J/$\ddot{I}ˆ\hat{I}›\ddot{I}•$ decay in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

The observation of the $\hat{I}{›}_{\mathrm{b}}^0$ $\to$ J/$\ddot{I}ˆ\hat{I}›\ddot{I}•$ decay is reported using proton-proton collision data collected at $\sqrt{s}=$ 13 TeV by the CMS experiment at the LHC in 2018, corresponding to an integrated luminosity of 60 fb${}^{-1}$. The ratio of the branching fractions $\mathcal{B}(\hat{I}{›}_{\mathrm{b}}^0$ $\to$ J/$\ddot{I}ˆ\hat{I}›\ddot{I}•)$ $/$ $\mathcal{B}(\hat{I}{›}_{\mathrm{b}}^0$ $\to$ $\ddot{I}ˆ\hat{I}›)$ is measured to be (8.26 $\pm$ 0.90 (stat) $\pm$ 0.68 (syst) $\pm$ 0.11 $(\mathcal{B}))$ $\times$ 10${}^{-2}$, where the first uncertainty is statistical, the second is systematic, and the last uncertainty reflects the uncertainties in the world-average branching fractions of $\ddot{I}•$ and $\ddot{I}ˆ$(2S) decays to the reconstructed final states.

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/BPH-19-002 (CMS Public Pages)